Python Basic introduction （ A full set of nanny level tutorials ）

Chapter two

In the third quarter ： String general operation

*** Generally, the operation of string will not affect the original string . It usually returns a new string .

capitalize String case conversion

s = "python"
s1 = s.capitalize()
print(s1)

title Capitalize the first letter of a word

s = "I have a dream!"
s1 = s.title()  #  Capitalize the first letter of a word 
print(s1)

lower To lower case letters

s = "I HAVE A DREAM"
s1 = s.lower()  #  To lower case letters 
print(s1)

upper Turn all letters into capital letters

s = "i have a dream"
s1 = s.upper()  #  Turn all letters into capital letters 
print(s1)

How to ignore case to judge => upper(), Case implementation ignores the case of English input verification code ：

verify_code = "xAd1"
user_input = input(f" Please enter the verification code ({
      verify_code}): ")
if verify_code.upper() == user_input.upper():
    print(" The verification code is correct ")
else:
    print(" The verification code is incorrect ")

summary ：
String operation does not change the original string .
capitalize String case conversion
title Capitalize the first letter of a word
lower To lower case letters
upper Turn all letters into capital letters