问题:

How do I make a simple Menu/Directory using Python? I would like to have letters that the user would press to do tasks, and when they enter the letter after the prompt, the task is done... for example:

A. Create Username
B. Edit Username
C. Exit

Choice:

And then all the user has to do is enter one of the letters after the prompt.

回答1:

A (very) basic approach would be something like this:

print "A. Create Username"
print "B. Edit Username"
input = raw_input("Enter your choice")

if input == "A":
    print "A was given" 
if input == "B":
    print "B was given"

回答2:

A very basic version:

def foo():
    print "Creating username..."

def bar():
    print "Editing username..."

while True:
    print "A. Create Username"
    print "B. Edit Username"
    print "C. Exit"
    choice = raw_input()
    if choice.lower() == 'a':
       foo()
    elif choice.lower() == 'b':
       bar()
    elif choice.lower() == 'c':
       break
    else:
       print "Invalid choice"

Accepts upper- and lower-case letters as choice.