python -c “print calculation” gives syntax error












0















I was doing some bash scripting and adding some python for float calculations like divide, deductions



When I am executing this, all part is running fine but for some python part it is showing me an error, however, in the latter part, it is showing me correct calculations.



File "<string>", line 1

    print 0.05-

              ^

SyntaxError: invalid syntax

  File "<string>", line 1

    print /2

          ^

SyntaxError: invalid syntax


My script is like the following:



tx_fee=0.0001;

panda_txfee=$(python -c "print $check_t_balance-$tx_fee");

panda=$(python -c "print $panda_txfee/2");


What I am doing wrong?






shell-script python variable







share|improve this question




















  • 1





    Do those variables have actual values? An unassigned variable expands to the empty string, which this looks like. (I assume you have $check_t_balance set somewhere?)

    – Ulrich Schwarz
    Feb 7 at 12:31











  • yes, at the begining I declared all the variables with either int or float values

    – Rakib Fiha
    Feb 7 at 12:32








  • 1





    If I set check_t_balance=1 and run your code, I get $panda as 0.49995. I think you're just not setting the check_t_balance variable. Also, Python is a bit heavy weight just for doing floating point arithmetics in the shell. Either use something less heavy, such as bc, or do it all in one single Python program.

    – Kusalananda
    Feb 7 at 12:35








  • 2





    To answer questions about possible problems with your variables we would have to see how you set the variables, what you do with functions etc. You should try to create a minimal script that reproduces the problem.

    – Bodo
    Feb 7 at 12:47






  • 1





    for your division problem see stackoverflow.com/questions/1267869/…

    – Bodo
    Feb 7 at 13:08
















0















I was doing some bash scripting and adding some python for float calculations like divide, deductions



When I am executing this, all part is running fine but for some python part it is showing me an error, however, in the latter part, it is showing me correct calculations.



File "<string>", line 1

    print 0.05-

              ^

SyntaxError: invalid syntax

  File "<string>", line 1

    print /2

          ^

SyntaxError: invalid syntax


My script is like the following:



tx_fee=0.0001;

panda_txfee=$(python -c "print $check_t_balance-$tx_fee");

panda=$(python -c "print $panda_txfee/2");


What I am doing wrong?






shell-script python variable







share|improve this question




















  • 1





    Do those variables have actual values? An unassigned variable expands to the empty string, which this looks like. (I assume you have $check_t_balance set somewhere?)

    – Ulrich Schwarz
    Feb 7 at 12:31











  • yes, at the begining I declared all the variables with either int or float values

    – Rakib Fiha
    Feb 7 at 12:32








  • 1





    If I set check_t_balance=1 and run your code, I get $panda as 0.49995. I think you're just not setting the check_t_balance variable. Also, Python is a bit heavy weight just for doing floating point arithmetics in the shell. Either use something less heavy, such as bc, or do it all in one single Python program.

    – Kusalananda
    Feb 7 at 12:35








  • 2





    To answer questions about possible problems with your variables we would have to see how you set the variables, what you do with functions etc. You should try to create a minimal script that reproduces the problem.

    – Bodo
    Feb 7 at 12:47






  • 1





    for your division problem see stackoverflow.com/questions/1267869/…

    – Bodo
    Feb 7 at 13:08














0












0








0








I was doing some bash scripting and adding some python for float calculations like divide, deductions



When I am executing this, all part is running fine but for some python part it is showing me an error, however, in the latter part, it is showing me correct calculations.



File "<string>", line 1

    print 0.05-

              ^

SyntaxError: invalid syntax

  File "<string>", line 1

    print /2

          ^

SyntaxError: invalid syntax


My script is like the following:



tx_fee=0.0001;

panda_txfee=$(python -c "print $check_t_balance-$tx_fee");

panda=$(python -c "print $panda_txfee/2");


What I am doing wrong?






shell-script python variable







share|improve this question
















I was doing some bash scripting and adding some python for float calculations like divide, deductions



When I am executing this, all part is running fine but for some python part it is showing me an error, however, in the latter part, it is showing me correct calculations.



File "<string>", line 1

    print 0.05-

              ^

SyntaxError: invalid syntax

  File "<string>", line 1

    print /2

          ^

SyntaxError: invalid syntax


My script is like the following:



tx_fee=0.0001;

panda_txfee=$(python -c "print $check_t_balance-$tx_fee");

panda=$(python -c "print $panda_txfee/2");


What I am doing wrong?






shell-script python variable




shell-script python variable






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited Feb 7 at 13:19









Jeff Schaller

41.7k1156133




41.7k1156133










asked Feb 7 at 12:29









Rakib FihaRakib Fiha

217




217








  • 1





    Do those variables have actual values? An unassigned variable expands to the empty string, which this looks like. (I assume you have $check_t_balance set somewhere?)

    – Ulrich Schwarz
    Feb 7 at 12:31











  • yes, at the begining I declared all the variables with either int or float values

    – Rakib Fiha
    Feb 7 at 12:32








  • 1





    If I set check_t_balance=1 and run your code, I get $panda as 0.49995. I think you're just not setting the check_t_balance variable. Also, Python is a bit heavy weight just for doing floating point arithmetics in the shell. Either use something less heavy, such as bc, or do it all in one single Python program.

    – Kusalananda
    Feb 7 at 12:35








  • 2





    To answer questions about possible problems with your variables we would have to see how you set the variables, what you do with functions etc. You should try to create a minimal script that reproduces the problem.

    – Bodo
    Feb 7 at 12:47






  • 1





    for your division problem see stackoverflow.com/questions/1267869/…

    – Bodo
    Feb 7 at 13:08














  • 1





    Do those variables have actual values? An unassigned variable expands to the empty string, which this looks like. (I assume you have $check_t_balance set somewhere?)

    – Ulrich Schwarz
    Feb 7 at 12:31











  • yes, at the begining I declared all the variables with either int or float values

    – Rakib Fiha
    Feb 7 at 12:32








  • 1





    If I set check_t_balance=1 and run your code, I get $panda as 0.49995. I think you're just not setting the check_t_balance variable. Also, Python is a bit heavy weight just for doing floating point arithmetics in the shell. Either use something less heavy, such as bc, or do it all in one single Python program.

    – Kusalananda
    Feb 7 at 12:35








  • 2





    To answer questions about possible problems with your variables we would have to see how you set the variables, what you do with functions etc. You should try to create a minimal script that reproduces the problem.

    – Bodo
    Feb 7 at 12:47






  • 1





    for your division problem see stackoverflow.com/questions/1267869/…

    – Bodo
    Feb 7 at 13:08








1




1





Do those variables have actual values? An unassigned variable expands to the empty string, which this looks like. (I assume you have $check_t_balance set somewhere?)

– Ulrich Schwarz
Feb 7 at 12:31





Do those variables have actual values? An unassigned variable expands to the empty string, which this looks like. (I assume you have $check_t_balance set somewhere?)

– Ulrich Schwarz
Feb 7 at 12:31













yes, at the begining I declared all the variables with either int or float values

– Rakib Fiha
Feb 7 at 12:32







yes, at the begining I declared all the variables with either int or float values

– Rakib Fiha
Feb 7 at 12:32






1




1





If I set check_t_balance=1 and run your code, I get $panda as 0.49995. I think you're just not setting the check_t_balance variable. Also, Python is a bit heavy weight just for doing floating point arithmetics in the shell. Either use something less heavy, such as bc, or do it all in one single Python program.

– Kusalananda
Feb 7 at 12:35







If I set check_t_balance=1 and run your code, I get $panda as 0.49995. I think you're just not setting the check_t_balance variable. Also, Python is a bit heavy weight just for doing floating point arithmetics in the shell. Either use something less heavy, such as bc, or do it all in one single Python program.

– Kusalananda
Feb 7 at 12:35






2




2





To answer questions about possible problems with your variables we would have to see how you set the variables, what you do with functions etc. You should try to create a minimal script that reproduces the problem.

– Bodo
Feb 7 at 12:47





To answer questions about possible problems with your variables we would have to see how you set the variables, what you do with functions etc. You should try to create a minimal script that reproduces the problem.

– Bodo
Feb 7 at 12:47




1




1





for your division problem see stackoverflow.com/questions/1267869/…

– Bodo
Feb 7 at 13:08





for your division problem see stackoverflow.com/questions/1267869/…

– Bodo
Feb 7 at 13:08










1 Answer
1






active

oldest

votes


















2














That works:



> tx_fee=0.0001;

> panda_txfee=$(python -c "print $check_t_balance-$tx_fee");

> panda=$(python -c "print $panda_txfee/2");

>

> echo $panda

-5e-05


Your errors show that variable panda_txfree is empty: 



  File "<string>", line 1

    print /2

          ^

SyntaxError: invalid syntax


and it is empty because of tx_fee is empty:



File "<string>", line 1

    print 0.05-

              ^

SyntaxError: invalid syntax


provide more details of your environment.



Also note, I'm using Python 2.7 (and Bash), for Python 3 you will need embrace print arguments in round parenthesis, like this: print($panda_txfee/2), because in Python 3 print is a function, not special keyword for printing out.






share|improve this answer


























  • Tonight I am offline from that unix now, I will post it tomorrow.

    – Rakib Fiha
    Feb 7 at 13:49











  • I am using Python 2.7 as well. I think, I found the mistake, I did a silly spelling mistake, Everywhere I used the variable tx_fee but only in one place I wrote tx_fees, I will test it tomorrow. I hope this was the main and only reason of this error. I was thinking, I have many floats so is it better to wrap it within float function like this? or its just useless? amt=$(python -c "print(float($amt_aft_txfee/2))");

    – Rakib Fiha
    Feb 7 at 15:50








  • 1





    @RakibFiha, you can omit float() if value in your amt_aft_txfee variable goes with point, e.g. 2.5 or 2.0 also note, that in Python usually used Decimal (from module decimal) wrapper for precise calculations

    – rook
    Feb 7 at 16:02






  • 1





    @RakibFiha, In python 2, you might want float(x)/2, since x/2 would round/truncate the result if x is an integer. float(x/2) doesn't help in that, the conversion happens too late there

    – ilkkachu
    Feb 7 at 16:28











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1 Answer
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active

oldest

votes








1 Answer
1






active

oldest

votes









active

oldest

votes






active

oldest

votes









2














That works:



> tx_fee=0.0001;

> panda_txfee=$(python -c "print $check_t_balance-$tx_fee");

> panda=$(python -c "print $panda_txfee/2");

>

> echo $panda

-5e-05


Your errors show that variable panda_txfree is empty: 



  File "<string>", line 1

    print /2

          ^

SyntaxError: invalid syntax


and it is empty because of tx_fee is empty:



File "<string>", line 1

    print 0.05-

              ^

SyntaxError: invalid syntax


provide more details of your environment.



Also note, I'm using Python 2.7 (and Bash), for Python 3 you will need embrace print arguments in round parenthesis, like this: print($panda_txfee/2), because in Python 3 print is a function, not special keyword for printing out.






share|improve this answer


























  • Tonight I am offline from that unix now, I will post it tomorrow.

    – Rakib Fiha
    Feb 7 at 13:49











  • I am using Python 2.7 as well. I think, I found the mistake, I did a silly spelling mistake, Everywhere I used the variable tx_fee but only in one place I wrote tx_fees, I will test it tomorrow. I hope this was the main and only reason of this error. I was thinking, I have many floats so is it better to wrap it within float function like this? or its just useless? amt=$(python -c "print(float($amt_aft_txfee/2))");

    – Rakib Fiha
    Feb 7 at 15:50








  • 1





    @RakibFiha, you can omit float() if value in your amt_aft_txfee variable goes with point, e.g. 2.5 or 2.0 also note, that in Python usually used Decimal (from module decimal) wrapper for precise calculations

    – rook
    Feb 7 at 16:02






  • 1





    @RakibFiha, In python 2, you might want float(x)/2, since x/2 would round/truncate the result if x is an integer. float(x/2) doesn't help in that, the conversion happens too late there

    – ilkkachu
    Feb 7 at 16:28
















2














That works:



> tx_fee=0.0001;

> panda_txfee=$(python -c "print $check_t_balance-$tx_fee");

> panda=$(python -c "print $panda_txfee/2");

>

> echo $panda

-5e-05


Your errors show that variable panda_txfree is empty: 



  File "<string>", line 1

    print /2

          ^

SyntaxError: invalid syntax


and it is empty because of tx_fee is empty:



File "<string>", line 1

    print 0.05-

              ^

SyntaxError: invalid syntax


provide more details of your environment.



Also note, I'm using Python 2.7 (and Bash), for Python 3 you will need embrace print arguments in round parenthesis, like this: print($panda_txfee/2), because in Python 3 print is a function, not special keyword for printing out.






share|improve this answer


























  • Tonight I am offline from that unix now, I will post it tomorrow.

    – Rakib Fiha
    Feb 7 at 13:49











  • I am using Python 2.7 as well. I think, I found the mistake, I did a silly spelling mistake, Everywhere I used the variable tx_fee but only in one place I wrote tx_fees, I will test it tomorrow. I hope this was the main and only reason of this error. I was thinking, I have many floats so is it better to wrap it within float function like this? or its just useless? amt=$(python -c "print(float($amt_aft_txfee/2))");

    – Rakib Fiha
    Feb 7 at 15:50








  • 1





    @RakibFiha, you can omit float() if value in your amt_aft_txfee variable goes with point, e.g. 2.5 or 2.0 also note, that in Python usually used Decimal (from module decimal) wrapper for precise calculations

    – rook
    Feb 7 at 16:02






  • 1





    @RakibFiha, In python 2, you might want float(x)/2, since x/2 would round/truncate the result if x is an integer. float(x/2) doesn't help in that, the conversion happens too late there

    – ilkkachu
    Feb 7 at 16:28














2












2








2







That works:



> tx_fee=0.0001;

> panda_txfee=$(python -c "print $check_t_balance-$tx_fee");

> panda=$(python -c "print $panda_txfee/2");

>

> echo $panda

-5e-05


Your errors show that variable panda_txfree is empty: 



  File "<string>", line 1

    print /2

          ^

SyntaxError: invalid syntax


and it is empty because of tx_fee is empty:



File "<string>", line 1

    print 0.05-

              ^

SyntaxError: invalid syntax


provide more details of your environment.



Also note, I'm using Python 2.7 (and Bash), for Python 3 you will need embrace print arguments in round parenthesis, like this: print($panda_txfee/2), because in Python 3 print is a function, not special keyword for printing out.






share|improve this answer















That works:



> tx_fee=0.0001;

> panda_txfee=$(python -c "print $check_t_balance-$tx_fee");

> panda=$(python -c "print $panda_txfee/2");

>

> echo $panda

-5e-05


Your errors show that variable panda_txfree is empty: 



  File "<string>", line 1

    print /2

          ^

SyntaxError: invalid syntax


and it is empty because of tx_fee is empty:



File "<string>", line 1

    print 0.05-

              ^

SyntaxError: invalid syntax


provide more details of your environment.



Also note, I'm using Python 2.7 (and Bash), for Python 3 you will need embrace print arguments in round parenthesis, like this: print($panda_txfee/2), because in Python 3 print is a function, not special keyword for printing out.







share|improve this answer














share|improve this answer



share|improve this answer








edited Feb 7 at 13:47

























answered Feb 7 at 13:40









rookrook

4771714




4771714













  • Tonight I am offline from that unix now, I will post it tomorrow.

    – Rakib Fiha
    Feb 7 at 13:49











  • I am using Python 2.7 as well. I think, I found the mistake, I did a silly spelling mistake, Everywhere I used the variable tx_fee but only in one place I wrote tx_fees, I will test it tomorrow. I hope this was the main and only reason of this error. I was thinking, I have many floats so is it better to wrap it within float function like this? or its just useless? amt=$(python -c "print(float($amt_aft_txfee/2))");

    – Rakib Fiha
    Feb 7 at 15:50








  • 1





    @RakibFiha, you can omit float() if value in your amt_aft_txfee variable goes with point, e.g. 2.5 or 2.0 also note, that in Python usually used Decimal (from module decimal) wrapper for precise calculations

    – rook
    Feb 7 at 16:02






  • 1





    @RakibFiha, In python 2, you might want float(x)/2, since x/2 would round/truncate the result if x is an integer. float(x/2) doesn't help in that, the conversion happens too late there

    – ilkkachu
    Feb 7 at 16:28



















  • Tonight I am offline from that unix now, I will post it tomorrow.

    – Rakib Fiha
    Feb 7 at 13:49











  • I am using Python 2.7 as well. I think, I found the mistake, I did a silly spelling mistake, Everywhere I used the variable tx_fee but only in one place I wrote tx_fees, I will test it tomorrow. I hope this was the main and only reason of this error. I was thinking, I have many floats so is it better to wrap it within float function like this? or its just useless? amt=$(python -c "print(float($amt_aft_txfee/2))");

    – Rakib Fiha
    Feb 7 at 15:50








  • 1





    @RakibFiha, you can omit float() if value in your amt_aft_txfee variable goes with point, e.g. 2.5 or 2.0 also note, that in Python usually used Decimal (from module decimal) wrapper for precise calculations

    – rook
    Feb 7 at 16:02






  • 1





    @RakibFiha, In python 2, you might want float(x)/2, since x/2 would round/truncate the result if x is an integer. float(x/2) doesn't help in that, the conversion happens too late there

    – ilkkachu
    Feb 7 at 16:28

















Tonight I am offline from that unix now, I will post it tomorrow.

– Rakib Fiha
Feb 7 at 13:49





Tonight I am offline from that unix now, I will post it tomorrow.

– Rakib Fiha
Feb 7 at 13:49













I am using Python 2.7 as well. I think, I found the mistake, I did a silly spelling mistake, Everywhere I used the variable tx_fee but only in one place I wrote tx_fees, I will test it tomorrow. I hope this was the main and only reason of this error. I was thinking, I have many floats so is it better to wrap it within float function like this? or its just useless? amt=$(python -c "print(float($amt_aft_txfee/2))");

– Rakib Fiha
Feb 7 at 15:50







I am using Python 2.7 as well. I think, I found the mistake, I did a silly spelling mistake, Everywhere I used the variable tx_fee but only in one place I wrote tx_fees, I will test it tomorrow. I hope this was the main and only reason of this error. I was thinking, I have many floats so is it better to wrap it within float function like this? or its just useless? amt=$(python -c "print(float($amt_aft_txfee/2))");

– Rakib Fiha
Feb 7 at 15:50






1




1





@RakibFiha, you can omit float() if value in your amt_aft_txfee variable goes with point, e.g. 2.5 or 2.0 also note, that in Python usually used Decimal (from module decimal) wrapper for precise calculations

– rook
Feb 7 at 16:02





@RakibFiha, you can omit float() if value in your amt_aft_txfee variable goes with point, e.g. 2.5 or 2.0 also note, that in Python usually used Decimal (from module decimal) wrapper for precise calculations

– rook
Feb 7 at 16:02




1




1





@RakibFiha, In python 2, you might want float(x)/2, since x/2 would round/truncate the result if x is an integer. float(x/2) doesn't help in that, the conversion happens too late there

– ilkkachu
Feb 7 at 16:28





@RakibFiha, In python 2, you might want float(x)/2, since x/2 would round/truncate the result if x is an integer. float(x/2) doesn't help in that, the conversion happens too late there

– ilkkachu
Feb 7 at 16:28


















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