Python 字符串格式化

mystr1="calc"mystr2="notepad"print(mystr1+mystr2)#字符串加法print(mystr1*4) #4个字符串串联,字符串只有整数乘法print(mystr2[4])  #截取一个字符，编号为4,实际第五个print(mystr2[2:3]) #字符串print('c'  in 'calc')  #falseprint('X'  not in  'calc') #true  判断一个字符在或者不在print('calc'  in   'mycalc')  #判断一个字符串是否被最后一个字符串包含print('calc' not in   'mycalc')print("12345\n12345")  #\r\n  \n都起到换行作用，print(format("1","10s"),"12") #对齐作用print(format("12","10s"),"123")print(format("123","10s"),"1234")print(format("1234","10s"),"12345")num=10mystr='这里有%d个苹果！'%(num)  #格式化print(mystr)#10代表宽度  ，默认是右对齐，-代表左对齐  .2f代表小数点后面两位#左边默认填充空格，填空为0，加上0print("%-10.2f %f"%(1.23,1.9))print("%-10.2f %f"%(1.2345,2.19))print("%010.2f %f"%(1.234567,3.129))print("%010.2f %f"%(1.2345678,4.1239))print("hello  %%    %f" %(10.5)) #%%代表输出一个%，为了区别