Calling functions based on a if condition in python

Question

i have to call the main function based on the number of arguments passed. When i call the script the functions are not working.

Sample Code:

    def func1():
      somecode
    def func2():
      somecode
    def func3():
      somecode
    def main():
      if len(sys.argv) == "5":
        func1()
        func3()
      elif len(sys.argv) == "8":
       func2()
       func3()
    if __name__ == '__main__':
      main()

What is your question? On a side note, one obvious problem: don't compare strings ("5") and integers (len(...)). — Anthony Labarre, Feb 11 '18 at 15:28
when i call the script, the func1 and func2 and func3 are not working. — Ramesh Eol, Feb 11 '18 at 15:30
Possible duplicate? https://stackoverflow.com/questions/40403108/how-can-python-compare-strings-with-integers — mkrieger1, Feb 11 '18 at 15:31
`5 != "5"`, as mentioned, use `if len(sys.argv) == 5:` and `elif len(sys.argv) == 8:` to correctly compare the number of arguments passed. — eugenhu, Feb 11 '18 at 15:35
Possible duplicate of [How can Python compare strings with integers?](https://stackoverflow.com/questions/40403108/how-can-python-compare-strings-with-integers) — A. Smoliak, Feb 11 '18 at 16:51

score 0 · Accepted Answer · answered Feb 11 '18 at 15:36

In your code you are comparing len(sys.argv) with a string:

  if len(sys.argv) == "5":
    func1()
    func3()
  elif len(sys.argv) == "8":
   func2()
   func3()

changing to

  if len(sys.argv) == 5:
    func1()
    func3()
  elif len(sys.argv) == 8:
   func2()
   func3()

should do the trick

score 0 · Answer 2 · answered Feb 11 '18 at 15:36

0

Your code is not calling those functions because this if-test:

if len(sys.argv) == "5":

is always False. The function len() returns an integer and an integer in Python is never equal to a string. Do this instead:

if len(sys.argv) == 5:

answered Feb 11 '18 at 15:36

BoarGules

15,507
2
28
42

Calling functions based on a if condition in python

2 Answers2