《笨办法学 Python》学习笔记04 if-while-for

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本文介绍了Python编程中的条件判断（if语句）和循环（for与while循环），通过实例展示了如何使用这些基本控制结构进行简单的逻辑处理。

# Python expects you to indent something after you end a line

with a : (colon).

if people < cats:
    print "Too many cats! The world is doomed!"

if cars > people:
    print "We should take the cars."
elif cars < people:
    print "We should not take the cars."
else:
    print "We can't decide."

if people > buses:
    print "Alright, let's just take the buses."
else:
    print "Fine, let's stay home then."

For-loop

the_count = [1, 2, 3, 4, 5]
for number in the_count:
    print "This is count %d" % number

elements = []
for i in range(0, 6):
    print "Adding %d to the list." % i
    elements.append(i)
for i in elements:
    print "Element was: %d" % i

While-loop

# Make sure that you use while-loops sparingly. Usually a for-loop is better.