如果用户输入等于字符串，用 Python 做一些事情

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如果用户输入等于字符串，用 Python 做一些事情

If user input equals string, do something in Python

如果用户输入等于一个字符串，例如，使用相等运算符来做某事if user_input == my_str:。True如果用户输入等于字符串，则相等运算符将返回，False否则返回。

主程序
# ✅ If user input equals string, do something

user_input = input('Enter your favorite fruit: ')

my_str = 'apple'

if user_input == my_str:
    print('Correct')
else:
    print('String does NOT match')

# -------------------------------------------------------

# ✅ If user input equals one of multiple strings, do something

user_input = input('Enter your favorite fruit: ')

options = ('apple', 'banana', 'kiwi')

if user_input in options:
    print('Correct')
else:
    print('String does NOT match')

第一个示例使用相等 (==) 运算符来检查用户输入是否等于字符串。

主程序
user_input = input('Enter your favorite fruit: ')

my_str = 'apple'

if user_input == my_str:
    print('Correct')
else:
    print('String does NOT match')
True如果左侧和右侧的值相等，则相等运算符返回，False否则返回。

如果您需要检查用户输入是否等于字符串，忽略大小写，将两个字符串都转换为小写。

主程序
user_input = input('Enter your favorite fruit: ')

my_str = 'apple'

if user_input.lower() == my_str.lower():
    print('Correct')
else:
    print('String does NOT match')

The str.lower
method returns a copy of the string with all the cased characters converted to
lowercase.

The method doesn’t change the original string, it returns a new string. Strings
are immutable in Python.

Both strings have to either be lowercase or uppercase to perform a
case-insensitive comparison.

If you need to check if a user input value is equal to one of multiple values,
use the in operator.

main.py
user_input = input('Enter your favorite fruit: ')

options = ['apple', 'banana', 'kiwi']

if user_input in options:
    print('Correct')
else:
    print('String does NOT match')

The
in operator
tests for membership. For example, x in l evaluates to True if x is a
member of l, otherwise it evaluates to False.

main.py
options = ['apple', 'banana', 'kiwi']

print('apple' in options)  # 👉️ True

print('melon' in options)  # 👉️ False

The example checks if the input value is equal to any of the values in the
options list.

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