I'm puzzled by the following behaviour:
The following works as I expect:
alex@x301:~/Python$ python3
Python 3.4.0 (default, Apr 11 2014, 13:05:18)
[GCC 4.8.2] on linux
Type "help", "copyright", "credits" or "license" for more information.
code = """\
... s1 = 'first'
... s2 = 'second'
... """
exec(code)
s1
'first'
s2
'second'
..the following script also behaves as I expect:
alex@x301:~/Python$ cat test.py
#!/usr/bin/env python3
"""
Testing use of exec().
"""
code = """\
s1 = 'first'
s2 = 'second'
"""
exec(code)
print(s1)
print(s2)
alex@x301:~/Python$ ./test.py
first
second
... but this one doesn't:
alex@x301:~/Python$ cat t1.py
#!/usr/bin/env python3
"""
Testing use of exec().
"""
code = """\
s1 = 'first'
s2 = 'second'
"""
def main():
exec(code)
print(s1)
if __name__ == "__main__":
main()
alex@x301:~/Python$ ./t1.py
Traceback (most recent call last):
File "./t1.py", line 15, in <module>
main()
File "./t1.py", line 12, in main
print(s1)
NameError: name 's1' is not defined
Any light that can be shed onto this would be appreciated.
Alex
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