for-loop on cmd-line

[Gisle Vanem]

Hello list. I'm a newbie when it comes to Python.

I'm trying to turn this:

def print_sys_path():
i = 0
for p in sys.path:
print ('sys.path[%2d]: %s' % (i, p))
i += 1

into a one-line python command (in a .bat file):

python -c "import sys,os; i=0; for p in sys.path: print('sys.path[%%2d]: %%s' %% (i, p)); i+=1"

But:
File "<string>", line 1
import sys,os; i=0; for p in sys.path: print('sys.path[%2d]: %s' % (i, p)); i+=1
^
SyntaxError: invalid syntax

The caret is on the 'for'. What's the problem?

--gv

 

[suzaku]

According to the document (http://docs.python.org/using/cmdline.html#interface-options),

When called with -c command, it executes the Python statement(s) given as command. Here command may contain multiple statements separated by newlines. Leading whitespace is significant in Python statements!

So you should replace the semicolon with newline.

BTW, the loop can be simplified using `enumerate` like this:

for i, p in enumerate(sys.path):

Hello list. I'm a newbie when it comes to Python.



I'm trying to turn this:



def print_sys_path():

i = 0

for p in sys.path:

print ('sys.path[%2d]: %s' % (i, p))

i += 1



into a one-line python command (in a .bat file):



python -c "import sys,os; i=0; for p in sys.path: print('sys.path[%%2d]: %%s' %% (i, p)); i+=1"



But:

File "<string>", line 1

import sys,os; i=0; for p in sys.path: print('sys.path[%2d]: %s' % (i, p)); i+=1

^

SyntaxError: invalid syntax



The caret is on the 'for'. What's the problem?



--gv

 

[suzaku]

According to the document (http://docs.python.org/using/cmdline.html#interface-options),

When called with -c command, it executes the Python statement(s) given as command. Here command may contain multiple statements separated by newlines. Leading whitespace is significant in Python statements!

So you should replace the semicolon with newline.

BTW, the loop can be simplified using `enumerate` like this:

for i, p in enumerate(sys.path):

Hello list. I'm a newbie when it comes to Python.



I'm trying to turn this:



def print_sys_path():

i = 0

for p in sys.path:

print ('sys.path[%2d]: %s' % (i, p))

i += 1



into a one-line python command (in a .bat file):



python -c "import sys,os; i=0; for p in sys.path: print('sys.path[%%2d]: %%s' %% (i, p)); i+=1"



But:

File "<string>", line 1

import sys,os; i=0; for p in sys.path: print('sys.path[%2d]: %s' % (i, p)); i+=1

^

SyntaxError: invalid syntax



The caret is on the 'for'. What's the problem?



--gv