#pythonçmap, filter, reduceçå½æ°é½æ¯ä¸ºäºç®åï¼æ¹ä¾¿å¾ªç¯listçå½æ°ã
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L = [1,2,3,4,5]
def my_map(L):
result = []
for e in L:
result.append(e*2+1)
return result
print map(lambda x:x*2+1, L)#è¾åº[3, 5, 7, 9, 11]
print my_map(L)#è¾åº[3, 5, 7, 9, 11]
#ä¸ç¨å½æ°
print [x*2+1 for x in L]#è¾åº[3, 5, 7, 9, 11]
#ä¸ç¨å½æ° 计ç®å¤§äºçäº3ç
print [x*2+1 for x in L if x >= 3]#è¾åº[7, 9, 11]
#使ç¨map filter 计ç®å¤§äºçäº3ç,
print map(lambda x:x*2+1, filter(lambda x:x>=3,L))#è¾åº[7, 9, 11]
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