How do I call a function in python?

Question

I am trying to call a new function called def importFile(): however i am getting the error saying that importFile() isn't defined. What am i doing wrong, I know this is probably simple but I'm new to coding.

This is the section where I am trying to call the function:

 def main():
        myMode = input("Encrypt 'e' or Decrypt 'd': ")
        textFile = input("Would you like to import a text file 'Y' or 'N': ")
        if textFile == 'y' or textFile == 'Y':
            importFile()   
        myMessage = input('Enter your text: ')
        myKey = input('Enter your key: ')
        myKey2 = input('Enter your second key: ')
        if myMode == 'encrypt' or myMode == 'e':
            translated = encryptMessage(myKey, myMessage)
        elif myMode == 'decrypt' or myMode == 'd':
            translated = decryptMessage(myKey, myMessage)
        print('%sYour Message: ' % (myMode.title()))
        print(translated)
        print()

This is the Function:

def importFile():
    importText = []
    fileLocation = input('What is the name of the text file: ')
    open('fileLocation''r')

As you can probably tell i am trying to import text files in to python but haven't passed the first hurdle:)

Here is all the code:

LETTERS = 'ZABCDEFGHIJKLMNOPQRSTUVWXY'
def main():
    myMode = input("Encrypt 'e' or Decrypt 'd': ")
    textFile = input("Would you like to import a text file 'Y' or 'N': ")
    if textFile.lower() == 'y' :
        importFile()   
    myMessage = input('Enter your text: ')
    myKey = input('Enter your key: ')
    myKey2 = input('Enter your second key: ')
    if myMode == 'encrypt' or myMode == 'e':
        translated = encryptMessage(myKey, myMessage)
    elif myMode == 'decrypt' or myMode == 'd':
        translated = decryptMessage(myKey, myMessage)
    print('%sYour Message: ' % (myMode.title()))
    print(translated)
    print()

def encryptMessage(key, message):
    return translateMessage(key, message, 'encrypt')

def decryptMessage(key, message):
    return translateMessage(key, message, 'decrypt')

def translateMessage(key, message, mode):
    translated = []

    keyIndex = 0
    keys = key.upper()

    for symbol in message: 
        num =LETTERS .find(symbol.upper())
        if num != -1: 
            if mode == 'encrypt':
                num += LETTERS .find(key[keyIndex]) 
            elif mode == 'decrypt':
                num -= LETTERS .find(key[keyIndex])

            num %= len(LETTERS)

            if symbol.isupper():
                translated.append(LETTERS[num])
            elif symbol.islower():
                translated.append(LETTERS[num].lower())

            keyIndex += 1 
            if keyIndex == len(key):
                keyIndex = 0
        else:
            translated.append(symbol)
    return ''.join(translated)
if __name__ == '__main__':
    main()

def importFile():
    importText = []
    fileLocation = input('What is the name of the text file: ')
    open('fileLocation','r')

main()

Answer 1

It is the

if __name__ == '__main__':
    main()

def importFile():
    importText = []
    fileLocation = input('What is the name of the text file: ')
    open('fileLocation','r')

main()

part.

At

if __name__ == '__main__':
    main()

the main() function is called, but the importFile() isn't defined yet. Move it above the mentionned lines.

The additional main() at the end is not needed.