Simple raw_input and conditions

问题

I created the simple code:

name = raw_input("Hi. What's your name? \nType name: ")
age = raw_input("How old are you " + name + "? \nType age: ")

if age >= 21
    print "Margaritas for everyone!!!"
else:
    print "NO alcohol for you, young one!!!"

raw_input("\nPress enter to exit.")

It works great until I get to the 'if' statement... it tells me that I am using invalid syntax.

I am trying to learn how to use Python, and have messed around with the code quite a bit, but I can't figure out what I did wrong (probably something very basic).

回答1:

It should be something like this:

name = raw_input("Hi. What's your name? \nType name: ")
age = raw_input("How old are you " + name + "? \nType age: ")
age = int(age)

if age >= 21:
    print "Margaritas for everyone!!!"
else:
    print "NO alcohol for you, young one!!!"

raw_input("\nPress enter to exit.")

You were missing the colon. Also, you should cast age from string to int.

Hope this helps!

回答2:

With python, indentation is very important. You have to use the correct indentation or it won't work. Also, you need a : after the if and else

try:

if age >= 21:
    print #string
else:
    print #other string

回答3:

Firstly raw_input returns a string not integer, so use int(). Otherwise the if-condition if age >= 21 is always going to be False.:

>>> 21 > ''
False
>>> 21 > '1'
False

Code:

name = raw_input("Hi. What's your name? \nType name: ")
age = int(raw_input("How old are you " + name + "? \nType age: "))

The syntax error is there because you forgot a : on the if line.

if age >= 21
            ^
            |
       colon missing

来源：https://stackoverflow.com/questions/17572736/simple-raw-input-and-conditions

标签

python

if-statement

conditional-statements

raw-input