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python format()函数的使用技巧

时间2024-08-21 22:04:03发布访客分类主机资讯浏览376
导读:替换字符串中的占位符: name = "Alice" age = 30 message = "My name is {} and I am {} years old.".format(name, age print(message ...

  1. 替换字符串中的占位符:
name = "Alice"
age = 30
message = "My name is {
}
 and I am {
}
 years old.".format(name, age)
print(message)
  1. 指定占位符的顺序:
name = "Alice"
age = 30
message = "My name is {
1}
 and I am {
0}
 years old.".format(age, name)
print(message)
  1. 格式化数字的显示:
num = 123.456789
formatted_num = "{
:.2f}
".format(num)
print(formatted_num)  # 输出:123.46
  1. 格式化日期时间:
from datetime import datetime
now = datetime.now()
formatted_date = now.strftime("%Y-%m-%d %H:%M:%S")
print(formatted_date)
  1. 使用键值对替换占位符:
person = {
"name": "Alice", "age": 30}

message = "My name is {
name}
 and I am {
age}
 years old.".format(**person)
print(message)
  1. 使用列表替换占位符:
items = ["apple", "banana", "cherry"]
message = "I like {
}
 and {
}
 and {
}
    .".format(*items)
print(message)

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