格式化

# 打印百分比     两个百分号
s1 = "percent %.2f%%" % 99.8877
print(s1)

s1="i am %(name)s age %(age)d"%{"name":"gb","age":25}
print(s1)
#要传字典必须加**
s1="i am {name}， age{age}，really{name}".format(**{"name":"gb","age":25})
print(s1)

s1="i am {0[0]}， age{0[1]}，really{0[2]}".format([1,2,3],[11,22,33])
print(s1)

s1="i am {name:s}， age{age:d}".format(name="seven",age=19)
print(s1)

s1="i am {name:s}， age{age:d}".format(**{"name":"seven","age":19})
print(s1)

带一个*  表示传入一个列表
s1="i am {name:s}， age{age:d}".format(["seven",19])
print(s1)