python实用代码
【摘要】
1，翻转
字符串翻转
x = ''.join(reversed(x))
非负整数翻转，去掉前置0
def reverse(x: int) -> int: if x is 0: return 0 x = ''.join(reversed(str(x))) while x[0] is '0': ...
1，翻转
字符串翻转
x = ''.join(reversed(x))
非负整数翻转，去掉前置0
-
def reverse(x: int) -> int:
-
if x is 0:
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return 0
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x = ''.join(reversed(str(x)))
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while x[0] is '0':
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x = x[1:]
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return int(x)
整数翻转，去掉前置0
-
def reverse2(x: int) -> int:
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if x < 0:
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x = -reverse(-x)
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else:
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x = reverse(x)
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return x
2，list转化成map
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def listToMap(list:List)->dict:
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map=dict()
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for i in range(len(list)):
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map[list[i]]=i
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return map
3，数列转化成图片
-
row = 28
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col = 28
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str = '0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,51,159,253,159,50,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,48,238,252,252,252,237,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,54,227,253,252,239,233,252,57,6,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,10,60,224,252,253,252,202,84,252,253,122,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,163,252,252,252,253,252,252,96,189,253,167,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,51,238,253,253,190,114,253,228,47,79,255,168,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,48,238,252,252,179,12,75,121,21,0,0,253,243,50,0,0,0,0,0,0,0,0,0,0,0,0,0,38,165,253,233,208,84,0,0,0,0,0,0,253,252,165,0,0,0,0,0,0,0,0,0,0,0,0,7,178,252,240,71,19,28,0,0,0,0,0,0,253,252,195,0,0,0,0,0,0,0,0,0,0,0,0,57,252,252,63,0,0,0,0,0,0,0,0,0,253,252,195,0,0,0,0,0,0,0,0,0,0,0,0,198,253,190,0,0,0,0,0,0,0,0,0,0,255,253,196,0,0,0,0,0,0,0,0,0,0,0,76,246,252,112,0,0,0,0,0,0,0,0,0,0,253,252,148,0,0,0,0,0,0,0,0,0,0,0,85,252,230,25,0,0,0,0,0,0,0,0,7,135,253,186,12,0,0,0,0,0,0,0,0,0,0,0,85,252,223,0,0,0,0,0,0,0,0,7,131,252,225,71,0,0,0,0,0,0,0,0,0,0,0,0,85,252,145,0,0,0,0,0,0,0,48,165,252,173,0,0,0,0,0,0,0,0,0,0,0,0,0,0,86,253,225,0,0,0,0,0,0,114,238,253,162,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,85,252,249,146,48,29,85,178,225,253,223,167,56,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,85,252,252,252,229,215,252,252,252,196,130,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,28,199,252,252,253,252,252,233,145,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,25,128,252,253,252,141,37,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0'
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strlist = str.split(',')
-
-
I=numpy.zeros((row,col),dtype=numpy.uint8)
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for i in range(row):
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for j in range(col):
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I[i,j] = strlist[i*col+j]
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image = Image.fromarray(I)
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image.show()
4，整数和字符串互转
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def intToStrTmp(a,p):
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if a == 0:
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return ''
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xend = a%p
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a = a//p
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return intToStrTmp(a,p) + str(xend)
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def intToStr(a,p):
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if a == 0:
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return '0'
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return intToStrTmp(a,p)
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def strToInt(a,p):
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if a == '':
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return 0
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xend = int(a[-1])
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a = a[:-1]
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return strToInt(a,p)*p + xend
demo：
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a = 7
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b = intToStr(a,2)
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print(b)
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c10 = strToInt(b,10)
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print(c10)
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c2 = strToInt(b,2)
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print(c2)
输出：
111
111
7
文章来源: blog.csdn.net，作者：csuzhucong，版权归原作者所有，如需转载，请联系作者。
原文链接：blog.csdn.net/nameofcsdn/article/details/117392494
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