%与format的区别特别篇

Posted 2020-11-10 kermitjam

"""
%和format的区别？
"""
# 定义一个敌人的坐标
c = (250, 250)
利用%进行字符串格式化
print("向他开炮：%s" % c)
print("向他开炮：%s" % (c, ))


用format进行字符串的格式化
print("向他开炮：{}".format(c))


format的常见用法
l1 = ["Egon", 18]
# s = "{} is {} years old.".format(l1[0], l1[1])
s = "{} is {} years old.".format(*l1)
print(s)


通过关键字
d1 = {"name": "Egon", "age": 18}
# s = "{name} is {age} years old.".format(d1["name"], d1["age"])
s = "{name} is {age} years old.".format(**d1)
print(s)


通过对象属性
class Person():

    def __init__(self, name, age):
        self.name = name
        self.age = age

    def __str__(self):
        return "{self.name} - {self.age}".format(self=self)


p1 = Person("Egon", 18)
print(p1)


通过下标
l1 = ["Egon", 18]
# s = "{} is {} years old. {} 不要脸。".format(l1[0], l1[1], l1[0])
# s = "{0} is {1} years old. {0} 不要脸。".format(l1[0], l1[1])
s = "{0[0]} is {0[1]} years old. {0[0]} 不要脸。".format(l1)
print(s)


填充与对齐
print("egon".center(20, "*"))
print("{:>10}".format("egon"))
print("{:0>10}".format("egon"))
print("{:*>10}".format("egon"))
print("{:*^10}".format("egon"))
print("{:*<10}".format("egon"))


print("egon".zfill(18))
print("{:.2f}".format(3.141592653))
print("{:b}".format(10))
print("{:d}".format(10))
print("{:o}".format(10))
print("{:x}".format(10))


print("{:,}".format(1000000))