Python字符串相等

Python字符串的相等性可以使用==运算符或__eq__()函数进行检查。Python字符串区分大小写，因此这些相等性检查方法也是大小写敏感的。

Python字符串相等

让我们看一些示例来检查两个字符串是否相等。

s1 = 'Apple'

s2 = 'Apple'

s3 = 'apple'

# 大小写敏感的相等性检查
if s1 == s2:
    print('s1 and s2 are equal.')

if s1.__eq__(s2):
    print('s1 and s2 are equal.')

输出：

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

如果您想进行不等性检查，可以使用!=运算符。

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

输出：s1和s3不相等

Python字符串不区分大小写的相等性检查

有时候我们在检查两个字符串是否相等时不关心大小写，我们可以使用casefold()、lower()或upper()函数进行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')

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字符串与特殊字符相等

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())

输出：

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

这就是在Python中检查两个字符串是否相等的全部内容。

您可以从我们的GitHub代码库检查完整的脚本和更多Python字符串示例。