python学习笔记之基础操作（五）字符串格式化（1）%格式化

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格式化基本格式

s = "i am %s ,i am %d years old ,and i like %s"%("haiyang",20,"zhu")
print(s)
#区分数据类型，无法自动在字符串和数字之间转换，类型不对会报错,后面和前面参数要一一对应，否则会报错
s = "i am %s ,i am %d years old ,and i like %s"%("haiyang","20","zhu")
print(s)
s = "i am %s ,i am %d years old ,and i like %s"%("haiyang",20)
print(s)

i am haiyang ,i am 20 years old ,and i like zhu
i am haiyang ,i am 20 years old ,and i like zhu



---------------------------------------------------------------------------

TypeError                                 Traceback (most recent call last)

<ipython-input-4-0ef5cd109f66> in <module>()
      7 #s = "i am %s ,i am %d years old ,and i like %s"%("haiyang","20","zhu")
      8 print(s)
----> 9 s = "i am %s ,i am %d years old ,and i like %s"%("haiyang",20)
     10 print(s)


TypeError: not enough arguments for format string

定义变量名字，使用字典的方式格式化变量

s = "i am %(name)s ,i am %(age)d years old ,and i like %(girl)s"%{"name":"haiyang","age":20,"girl":"zhu"}
print(s)

i am haiyang ,i am 20 years old ,and i like zhu

定义输出的格式,字符串，小数均可以控制输出位数

s = "i am %.2s ,i am %d years old ,and i like %.2f"%("haiyang",20,20.2324324)
print(s)

i am ha ,i am 20 years old ,and i like 20.23