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一入python深似海--while-loop与for-loop
while loops
定义与实例
i = 0
numbers = []
while i < 6:
print "At the top i is %d" % i
numbers.append(i)
i = i + 1
print "Numbers now: ", numbers
print "At the bottom i is %d" % i
print "The numbers: "
for num in numbers:
print num，输出
At the top i is 0 Numbers now: [0] At the bottom i is 1 At the top i is 1 Numbers now: [0, 1] At the bottom i is 2 At the top i is 2 Numbers now: [0, 1, 2] At the bottom i is 3 At the top i is 3 Numbers now: [0, 1, 2, 3] At the bottom i is 4 At the top i is 4 Numbers now: [0, 1, 2, 3, 4] At the bottom i is 5 At the top i is 5 Numbers now: [0, 1, 2, 3, 4, 5] At the bottom i is 6 The numbers: 0 1 2 3 4 5
for loops
定义和实例
elements = []
# then use the range function to do 0 to 5 counts
for i in range(0, 6):
print "Adding %d to the list." % i
# append is a function that lists understand
elements.append(i)A&Q
What‘s the difference between a for-loop and a while-loop?
ans: A for-loop can only iterate (loop) "over" collections of things. A while-loop can do any kind of iteration (looping) you want. However, while-loops are harder to get right and you normally can get many things done with for-loops.
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