1, in the module, we need to determine whether __name__ is assigned to "__main__".
python <arguments>
2. In the case of script execution, the __name__ attribute of the module will be assigned to __main__, and that's why.
$ python 50 0 1 1 2 3 5 8 13 21 34
3. If imported as a module, it will not be executed:
>>> import fibo >>>
Knowledge Point Expansion:
Python Dynamic Declaration Variable Assignment Code Example
Through exec(), globals() and locals()
# By exec()
for i in range(1, 4):
# The first time you loop i=1, you execute the python statement ex1 = "exec1" in the string, and so on.
exec(f'ex{i} = "exec{i}"')
# By globals() and locals()
def test():
# globals()
for i in range(1, 4):
# At first loop i=1, execute globals()['gb1'] = 'global1', globals() is a dict
globals()[f'gb{i}'] = f'global{i}'
# locals()
for i in range(1, 4):
locals()[f'lc{i}'] = f'local{i}'
# Trying to print locals' variables
try:
print(lc1, lc2, lc3) # It's gonna be wrong
except Exception as e:
print(e)
print(locals()['lc1'], locals()['lc2'], locals()['lc3']) # By key-value pairs
if __name__ == '__main__':
# Execution
test()
print('---------------------')
# Print function-defined global variables
print(gb1, gb2, gb3)
print('---------------------')
# Print variables defined via exec()
print(ex1, ex2, ex3)
Output.
name 'lc1' is not defined local1 local2 local3 --------------------- global1 global2 global3 --------------------- exec1 exec2 exec3
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