字符串格式化

s = "i am %s , and i am %s" % ("an assassin", "a killer")
print(s)

s = "i am %s , age %d" % ("an assassin", 19)# %d 只能拼接数字
print(s)

#输出结果：

i am an assassin , and i am a killer
i am an assassin , age 19

#打印浮点数
s1 = "percent % f" % 99.62375187  #小数点后默认是六位
s2 = "percent % .2f" % 99.587627138678  #可以修改几位小数
print(s1)
print(s2)

#输出结果：
percent  99.623752
percent  99.59

#打印百分百比
s = "percent % .2f %%" % 99.62375187
print(s)

#输出结果：
percent  99.62 %

s = "i am {},age {},{}".format("reese", 20, "assassin")
print(s)

s = "i am {2},age {0},{1}".format("reese", 20, "assassin")
print(s)

#输出结果：
i am reese,age 20,assassin
i am assassin,age reese,20