Python基础篇之字符串方法总结

# 使用加号进行字符串拼接
name = "John"
age = 30
message = "My name is " + name + " and I'm " + str(age) + " years old."

# 使用字符串格式化进行字符串拼接
name = "John"
age = 30
message = "My name is %s and I'm %d years old." % (name, age)
# 使用format进行字符串拼接
name = "John"
age = 30
message = "My name is {} and I'm {}years old.".format(name, age)

# 使用split()方法进行字符串分割
message = "My name is John and I'm 30 years old."
parts = message.split(" ")  # 按照空格进行字符串分割
print(parts)  # ['My', 'name', 'is', 'John', 'and', "I'm", '30', 'years', 'old.']

# 使用replace()方法进行字符串替换
message = "Hello, world!"
new_message = message.replace("world", "Python")
print(new_message)  # Hello, Python!

# 使用upper()方法将字符串转换成大写形式
message = "Hello, world!"
new_message = message.upper()
print(new_message)  # HELLO, WORLD!

# 使用lower()方法将字符串转换成小写形式
message = "Hello, world!"
new_message = message.lower()
print(new_message)  # hello, world!

# 使用startswith()方法判断字符串是否以指定的子串开头
message = "Hello, world!"
if message.startswith("Hello"):
    print("The message starts with 'Hello'.")

# 使用endswith()方法判断字符串是否以指定的子串结尾
message = "Hello, world!"
if message.endswith("world!"):
    print("The message ends with 'world!'.")

# 使用isalpha()方法判断字符串是否全是字母
message = "Hello, world!"
if message.isalpha():
    print("The message is all letters.")
# 使用isdigit()方法判断

str.partition(separator)

s = "Hello, world!"
result = s.partition(",")
print(result) #('Hello', ',', ' world!')