eval string

[Brandon Harris]

Needing to pass a string command into a third party program and having
issues creating a string to do what I need.

here's what I have so far.

eval('import sys;
sys.stderr.write(\'\n\n\nCompleted!!!\nCompleted!!!\nCompleted!!!\nCompleted!!!\nCompleted!!!\nCompleted!!!\n\n\n\');')

Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "<string>", line 1
sys.stderr.write('
^
SyntaxError: EOL while scanning string literal


so I've changed it up every way I can think and I get other errors.

eval('import sys;
sys.stderr.write("\n\n\nCompleted!!!\nCompleted!!!\nCompleted!!!\nCompleted!!!\nCompleted!!!\nCompleted!!!\n\n\n");')

Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "<string>", line 1
import sys; sys.stderr.write("
^
SyntaxError: invalid syntax


Brandon L. Harris

 

[Peter Otten]

Needing to pass a string command into a third party program and having
issues creating a string to do what I need.

here's what I have so far.

eval('import sys;
sys.stderr.write(\'\n\n\nCompleted!!!\nCompleted!!!\nCompleted!!! \nCompleted!!!\nCompleted!!!\nCompleted!!!\n\n\n\');')

Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "<string>", line 1
sys.stderr.write('
^
SyntaxError: EOL while scanning string literal


so I've changed it up every way I can think and I get other errors.

eval('import sys;
sys.stderr.write("\n\n\nCompleted!!!\nCompleted!!!\nCompleted!!! \nCompleted!!!\nCompleted!!!\nCompleted!!!\n\n\n");')

Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "<string>", line 1
import sys; sys.stderr.write("
^
SyntaxError: invalid syntax


Brandon L. Harris

Python discriminates between statements and expressions. eval() can only
deal with expressions, but 'import whatever' is a statement. Try

exec 'import sys\nsys.stderr.write("completed!\n")'

instead.

 

[Peter Otten]

exec 'import sys\nsys.stderr.write("completed!\n")'

Oops, you need to escape the backslashes for newlines inside quotes inside
quotes:
completed!

Peter