Multi tool use

Python 3: Input in cmd to return functions

I'm currently working my way through "Learn Python the Hard Way" and got to the first exercise about functions. It's simply creating a few functions and printing them out like in the previous examples in the book`.

Code:

def print_two(*args):
arg1, arg2 = args
print("arg1: %r, arg2: %r" % (arg1, arg2))

def print_two_again(arg1, arg2):
print("arg1: %r, arg2: %r" % (arg1, arg2))

def print_one(arg1):
print("arg1: %r" % (arg1))

def print_none():
print("I got nothing.")

print_two("Zed","Shaw")
print_two_again("Zed","Shaw")
print_one("First!")
print_none()


Output in cmd:

C:Users[USER]Google DrivePythonLearn Python the Hard Way>python ex18.py
arg1: 'Zed', arg2: 'Shaw'
arg1: 'Zed', arg2: 'Shaw'
arg1: 'First!'
I got nothing.


I want to play around a bit with this, so instead of just giving me the above four lines when I run it, I want to be able to input the name of the function and then return the result. I tried with the following, but maybe I just don't understand how Python works?

x = input("> ")
print(x)


I'm not quite sure on the terminology but it would give me the following in cmd:

C:Users[USER]Google DrivePythonLearn Python the Hard Way>python ex18.py
> print_none() # This is something I write myself
I got nothing.


2 Answers
2

The question might have been a little vauge, but I found a solution myself. What I was looking for was the "import" function of the script into cmd, which then allows input the commands and return the lines that were hardcoded before:

C:Users[User]Google DrivePythonLearn Python the Hard Way>python
Python 3.7.0 (v3.7.0:1bf9cc5093, Jun 27 2018, 04:59:51) [MSC v.1914 64 bit (AMD64)] on
win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import ex18
arg1: 'Zed', arg2: 'Shaw'
arg1: 'Zed', arg2: 'Shaw'
arg1: 'First!'
I got nothing.
>>> ex18.print_none()
I got nothing.
>>>


def print_two_again(arg1, arg2):
print("arg1: %r, arg2: %r" % (arg1, arg2))

def print_one(arg1):
print("arg1: %r" % (arg1))

if __name__ == '__main__':
x = input("F name:")
eval(x)


Example:

/home/denis/zmqPG/bin/python /home/denis/PycharmProjects/useless/so2.py
F name:print_one(5)
arg1: 5


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