python -c “print calculation” gives syntax error
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 $panda_txfee/2");
What I am doing wrong?
shell-script python variable
|
show 3 more comments
I was doing some bash scripting and adding some python for float calculations like divide, deductions
When I am executing this, all part is running fine but for some python part it is showing me an error, however, in the latter part, it is showing me correct calculations.
File "<string>", line 1
print 0.05-
^
SyntaxError: invalid syntax
File "<string>", line 1
print /2
^
SyntaxError: invalid syntax
My script is like the following:
tx_fee=0.0001;
panda_txfee=$(python -c "print $check_t_balance-$tx_fee");
panda=$(python -c "print $panda_txfee/2");
What I am doing wrong?
shell-script python variable
1
Do those variables have actual values? An unassigned variable expands to the empty string, which this looks like. (I assume you have$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 setcheck_t_balance=1
and run your code, I get$panda
as0.49995
. I think you're just not setting thecheck_t_balance
variable. Also, Python is a bit heavy weight just for doing floating point arithmetics in the shell. Either use something less heavy, such asbc
, or do it all in one single Python program.
– Kusalananda
Feb 7 at 12:35
2
To answer questions about possible problems with your variables we would have to see how you set the variables, what you do with functions etc. You should try to create a minimal script that reproduces the problem.
– Bodo
Feb 7 at 12:47
1
for your division problem see stackoverflow.com/questions/1267869/…
– Bodo
Feb 7 at 13:08
|
show 3 more comments
I was doing some bash scripting and adding some python for float calculations like divide, deductions
When I am executing this, all part is running fine but for some python part it is showing me an error, however, in the latter part, it is showing me correct calculations.
File "<string>", line 1
print 0.05-
^
SyntaxError: invalid syntax
File "<string>", line 1
print /2
^
SyntaxError: invalid syntax
My script is like the following:
tx_fee=0.0001;
panda_txfee=$(python -c "print $check_t_balance-$tx_fee");
panda=$(python -c "print $panda_txfee/2");
What I am doing wrong?
shell-script python variable
I was doing some bash scripting and adding some python for float calculations like divide, deductions
When I am executing this, all part is running fine but for some python part it is showing me an error, however, in the latter part, it is showing me correct calculations.
File "<string>", line 1
print 0.05-
^
SyntaxError: invalid syntax
File "<string>", line 1
print /2
^
SyntaxError: invalid syntax
My script is like the following:
tx_fee=0.0001;
panda_txfee=$(python -c "print $check_t_balance-$tx_fee");
panda=$(python -c "print $panda_txfee/2");
What I am doing wrong?
shell-script python variable
shell-script python variable
edited Feb 7 at 13:19
Jeff Schaller
41.7k1156133
41.7k1156133
asked Feb 7 at 12:29
Rakib FihaRakib Fiha
217
217
1
Do those variables have actual values? An unassigned variable expands to the empty string, which this looks like. (I assume you have$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 setcheck_t_balance=1
and run your code, I get$panda
as0.49995
. I think you're just not setting thecheck_t_balance
variable. Also, Python is a bit heavy weight just for doing floating point arithmetics in the shell. Either use something less heavy, such asbc
, or do it all in one single Python program.
– Kusalananda
Feb 7 at 12:35
2
To answer questions about possible problems with your variables we would have to see how you set the variables, what you do with functions etc. You should try to create a minimal script that reproduces the problem.
– Bodo
Feb 7 at 12:47
1
for your division problem see stackoverflow.com/questions/1267869/…
– Bodo
Feb 7 at 13:08
|
show 3 more comments
1
Do those variables have actual values? An unassigned variable expands to the empty string, which this looks like. (I assume you have$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 setcheck_t_balance=1
and run your code, I get$panda
as0.49995
. I think you're just not setting thecheck_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 asbc
, 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 $panda
as 0.49995
. I think you're just not setting the check_t_balance
variable. Also, Python is a bit heavy weight just for doing floating point arithmetics in the shell. Either use something less heavy, such as bc
, or do it all in one single Python program.– Kusalananda
Feb 7 at 12:35
2
2
To answer questions about possible problems with your variables we would have to see how you set the variables, what you do with functions etc. You should try to create a minimal script that reproduces the problem.
– Bodo
Feb 7 at 12:47
To answer questions about possible problems with your variables we would have to see how you set the variables, what you do with functions etc. You should try to create a minimal script that reproduces the problem.
– Bodo
Feb 7 at 12:47
1
1
for your division problem see stackoverflow.com/questions/1267869/…
– Bodo
Feb 7 at 13:08
for your division problem see stackoverflow.com/questions/1267869/…
– Bodo
Feb 7 at 13:08
|
show 3 more comments
1 Answer
1
active
oldest
votes
That works:
> tx_fee=0.0001;
> panda_txfee=$(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.
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 omitfloat()
if value in youramt_aft_txfee
variable goes with point, e.g.2.5
or2.0
also note, that in Python usually usedDecimal
(from moduledecimal
) wrapper for precise calculations
– rook
Feb 7 at 16:02
1
@RakibFiha, In python 2, you might wantfloat(x)/2
, sincex/2
would round/truncate the result ifx
is an integer.float(x/2)
doesn't help in that, the conversion happens too late there
– ilkkachu
Feb 7 at 16:28
add a comment |
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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.
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 omitfloat()
if value in youramt_aft_txfee
variable goes with point, e.g.2.5
or2.0
also note, that in Python usually usedDecimal
(from moduledecimal
) wrapper for precise calculations
– rook
Feb 7 at 16:02
1
@RakibFiha, In python 2, you might wantfloat(x)/2
, sincex/2
would round/truncate the result ifx
is an integer.float(x/2)
doesn't help in that, the conversion happens too late there
– ilkkachu
Feb 7 at 16:28
add a comment |
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.
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 omitfloat()
if value in youramt_aft_txfee
variable goes with point, e.g.2.5
or2.0
also note, that in Python usually usedDecimal
(from moduledecimal
) wrapper for precise calculations
– rook
Feb 7 at 16:02
1
@RakibFiha, In python 2, you might wantfloat(x)/2
, sincex/2
would round/truncate the result ifx
is an integer.float(x/2)
doesn't help in that, the conversion happens too late there
– ilkkachu
Feb 7 at 16:28
add a comment |
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.
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.
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 omitfloat()
if value in youramt_aft_txfee
variable goes with point, e.g.2.5
or2.0
also note, that in Python usually usedDecimal
(from moduledecimal
) wrapper for precise calculations
– rook
Feb 7 at 16:02
1
@RakibFiha, In python 2, you might wantfloat(x)/2
, sincex/2
would round/truncate the result ifx
is an integer.float(x/2)
doesn't help in that, the conversion happens too late there
– ilkkachu
Feb 7 at 16:28
add a comment |
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 omitfloat()
if value in youramt_aft_txfee
variable goes with point, e.g.2.5
or2.0
also note, that in Python usually usedDecimal
(from moduledecimal
) wrapper for precise calculations
– rook
Feb 7 at 16:02
1
@RakibFiha, In python 2, you might wantfloat(x)/2
, sincex/2
would round/truncate the result ifx
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
add a comment |
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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
as0.49995
. I think you're just not setting thecheck_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 asbc
, 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