hold_space1 = "I am %s" % 97 #字符串占位符，把97当作字符串处理
print(hold_space1) # I am 97
hold_space2 = "I am %c%c" % (20013,22269) #字符占位符，输出数字对应的Unicode编码对应的字符
print(hold_space2) # I am 中国
hold_space3 = "I am %d" % 97 #整数占位符，把97当作整数
print(hold_space3) # I am 97
hold_space4 = "I am %f" % 97 #浮点数占位符，把97转换成浮点数
print(hold_space4) # I am 97.000000
hold_space5 = "I am %(name)s, %(age)d years old" % { "age":5000,"name":"汉字"}
#带名字的占位符，后面的顺序
print(hold_space5) # I am 汉字, 5000 years old
hold_space6 = "I am {name}, {age} years old" .format (name="汉字", age=5000)
# 这是另一种格式化的方式，具体细节不做详细介绍了
print(hold_space6)
