Python中的字符串操作

str1 = "Hello"
str2 = "World"
str3 = str1 + " " + str2
print(str3)  # 输出 "Hello World"

str = "Hello World"
sub_strs = str.split()
print(sub_strs)  # 输出 ["Hello", "World"]

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

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

str = "Hello {}"
new_str = str.format("Python")
print(new_str)  # 输出 "Hello Python"