how can i use a function directly in commandline in python?

Question

for example: my command line after execution of a program has to be like this:

perfect(44) #using the defined function in the output screen.(44) or any other number

and the output should be:

false

this the code i have tried but in this i cannot use the funcion in the command line.


def factors(n):
    factorlist = []
    for i in range(1,n):
        if n%i == 0:
            factorlist = factorlist + [i]
    print factorlist
    return factorlist

def perfect(n):
    factorlist = factors(n)
    if sum(factorlist) == n:
        return True
    else :
        return False

n = int(raw_input())
print(perfect(n))

Do you have the functions stored in a file? Or on command line? — user4880830
– user4880830, Commented Aug 9, 2017 at 1:17

user4880830 · Accepted Answer · 2017-08-09 01:19:05Z

4

Go to the path where you have the .py file located. Start the python interpreter in interactive mode by the following command:

python -i filename.py

By doing this, you should be able to access all functions inside your filename.py file.

answered Aug 9, 2017 at 1:19

user4880830

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Comments

alvits · Accepted Answer · 2017-08-09 01:27:35Z

1

You can append the following lines to your python script to call a function when the script is loaded.

if __name__ == '__main__':
    print(perfect(int(sys.argv[1])))

You can then call it like:

python myscript.py 44

answered Aug 9, 2017 at 1:27

alvits

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Comments

R.A.Munna · Accepted Answer · 2017-08-09 03:05:21Z

0

First go to the file directory and run the command from command line.

python -c "import modulename"

here modulename is your file_name.py

answered Aug 9, 2017 at 3:05

R.A.Munna

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Comments

Ryan · Accepted Answer · 2018-01-03 22:07:15Z

If you are open to using a 3rd party package, check out Google's Fire.

pip install fire

Modify your code as follows:

#!/usr/bin/env python
from fire import Fire

def factors(n):
    factorlist = []
    for i in range(1,n):
        if n%i == 0:
            factorlist = factorlist + [i]
    print factorlist
    return factorlist


def perfect(n):
    factorlist = factors(n)
    if sum(factorlist) == n:
        return True
    else :
        return False

# n = int(raw_input())
# print(perfect(n))

if __name__ == '__main__':
  Fire(perfect)

Make sure your file is executable if on Mac or Linux (sorry, have no idea if you have to do that on Windows). Assuming your code is in a file named perfect:

chmod +x perfect

If the file is in your path, you should now be able to call it like this:

$ perfect 44
[1, 2, 4, 11, 22]
False

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