CodeWar刷题代码收藏（一）

def tickets(people):  till = {100.0:0, 50.0:0, 25.0:0}  for paid in people:    till[paid] += 1    change = paid-25.0        for bill in (50,25):      while (bill <= change and till[bill] > 0):        till[bill] -= 1        change -= bill    if change != 0:      return 'NO'          return 'YES'

DNA 序列

import stringdef DNA_strand(dna):    return dna.translate(string.maketrans("ATCG","TAGC"))    # Python 3.4 solution || you don't need to import anything :)    # return dna.translate(str.maketrans("ATCG","TAGC"))

python字符串常见方法

join（）

str=""arr =['abc', 'de', 'dd']str.join( arr[i] for i in range(len(arr)) )

maketrans(  )

创建字符映射的转换表，对于接受两个参数的最简单的调用方式，第一个参数是字符串，表示需要转换的字符，第二个参数也是字符串表示转换的目标。

注：Python3.4已经没有string.maketrans()了，取而代之的是内建函数: bytearray.maketrans()、bytes.maketrans()、str.maketrans()

str1 ="abcde"str2 = "12345"trans = str.maketrans(str1,str2)str ="abbdadef"str.translate(trans)