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 字符串是区分大小写的，因此这些相等性检查方法也是区分大小写的。

Python 字符串相等性

让我们看一些示例，以检查两个字符串是否相等。

s1 = 'Apple'

s2 = 'Apple'

s3 = 'apple'

# 区分大小写的相等性检查
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.

如果你想执行不相等性检查，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

有时我们在检查两个字符串是否相等时不关心大小写，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 字符串包含特殊字符

讓我們來看一些包含特殊字符的字符串示例。

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())

輸出：

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

以上就是在 Python 中檢查兩個字符串是否相等的方法。

您可以從我們的 GitHub 存儲庫檢查完整的腳本和更多 Python 字符串示例。