Python 字符串操作实例

Python提供了丰富的字符串操作方法，下面列举几个常用的字符串操作实例：

1. 字符串拼接

str1 = "Hello"
str2 = "World"
result = str1 + " " + str2
print(result)  # Hello World

2. 字符串格式化

name = "Tom"
age = 20
result = "My name is {}, and I'm {} years old".format(name, age)
print(result)  # My name is Tom, and I'm 20 years old

3. 字符串切片

str = "Hello World"
result = str[6:11]
print(result)  # World

4. 字符串查找

str = "Hello World"
result = str.find("World")
print(result)  # 6

5. 字符串替换

str = "Hello World"
result = str.replace("World", "Python")
print(result)  # Hello Python

6. 字符串分割

str = "apple,banana,orange"
result = str.split(",")
print(result)  # ['apple', 'banana', 'orange']

7. 字符串大小写转换

str = "Hello World"
result1 = str.upper()
result2 = str.lower()
print(result1)  # HELLO WORLD
print(result2)  # hello world