Merge branch 'master' of https://github.com/JustDoPython/python-100-day

Author: chengxianhuan

.DS_Store

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+import itertools
+x = itertools.chain("abc", "xyz")
+print(list(x))

README.md

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+import itertools
+print(list(itertools.combinations("abc", r=2)))

day-039/.DS_Store

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+import itertools
+print(list(itertools.combinations_with_replacement("abc", r=2)))

day-039/itertools-chain-demo.py

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+import itertools
+data = [81, 82, 84, 76, 64, 78]
+tf = [1,1,0,1,1,0]
+print(list(itertools.compress(data, tf)))

day-039/itertools-combinations-demo.py

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+import itertools
+x = itertools.count(1,2)
+for k in x:
+	print(k, end=", ")

day-039/itertools-combinations_with_replacement-demo.py

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+import itertools
+x = itertools.cycle("XYZ")
+for k in x:
+	print(k, end = ", ")

day-039/itertools-compress-demo.py

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+import itertools
+x = itertools.dropwhile(lambda x: x < 5, [1,3,5,7,4,2,1])
+print(list(x))