Python strings equality can be checked using == operator or __eq__() function. Python strings are case sensitive, so these equality check methods are also case sensitive.

可以使用==运算符或__eq__()函数检查Python字符串是否相等。 Python字符串区分大小写，因此这些相等性检查方法也区分大小写。

Python字符串等于 (Python String equals)

Let’s look at some examples to check if two strings are equal or not.

让我们看一些示例，检查两个字符串是否相等。

s1 = 'Apple'
 
s2 = 'Apple'
 
s3 = 'apple'
 
# case sensitive equals check
if s1 == s2:
    print('s1 and s2 are equal.')
 
if s1.__eq__(s2):
    print('s1 and s2 are equal.')

Output:

输出：

s1 and s2 are equal.
s1 and s2 are equal.

If you want to perform inequality check, you can use != operator.

如果要执行不相等检查，可以使用!=运算符。

if s1 != s3:
    print('s1 and s3 are not equal')

Output: s1 and s3 are not equal

输出： s1 and s3 are not equal

Python字符串等于不区分大小写的检查 (Python String equals case-insensitive check)

Sometimes we don’t care about the case while checking if two strings are equal, we can use casefold(), lower() or upper() functions for case-insensitive equality check.

有时我们在检查两个字符串是否相等时不在乎大小写，可以将casefold() ， lower()或upper()函数用于不区分大小写的相等性检查。

if s1.casefold() == s3.casefold():
    print(s1.casefold())
    print(s3.casefold())
    print('s1 and s3 are equal in case-insensitive comparison')
 
if s1.lower() == s3.lower():
    print(s1.lower())
    print(s3.lower())
    print('s1 and s3 are equal in case-insensitive comparison')
 
if s1.upper() == s3.upper():
    print(s1.upper())
    print(s3.upper())
    print('s1 and s3 are equal in case-insensitive comparison')

Output:

输出：

apple
apple
s1 and s3 are equal in case-insensitive comparison
apple
apple
s1 and s3 are equal in case-insensitive comparison
APPLE
APPLE
s1 and s3 are equal in case-insensitive comparison

Python字符串等于特殊字符 (Python String equals with special characters)

Let’s look at some examples where strings contain special characters.

让我们看一些字符串包含特殊字符的示例。

s1 = '$#ç∂'
s2 = '$#ç∂'
 
print('s1 == s2?', s1 == s2)
print('s1 != s2?', s1 != s2)
print('s1.lower() == s2.lower()?', s1.lower() == s2.lower())
print('s1.upper() == s2.upper()?', s1.upper() == s2.upper())
print('s1.casefold() == s2.casefold()?', s1.casefold() == s2.casefold())

Output:

输出：

s1 == s2? True
s1 != s2? False
s1.lower() == s2.lower()? True
s1.upper() == s2.upper()? True
s1.casefold() == s2.casefold()? True

That’s all for checking if two strings are equal or not in Python.

这就是检查Python中两个字符串是否相等的全部。

翻译自: https://www.journaldev.com/23610/python-string-equals