笨办法学Python3 习题32和习题33

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本文深入探讨了Python中的循环结构，包括for循环和while循环的使用方法。通过具体示例，如遍历列表、构建列表等操作，展示了循环在实际编程中的应用。强调了for循环在处理已知迭代次数场景中的优势。

习题32 循环和列表

the_count = [1, 2, 3, 3, 5]
fruits = ['apples', 'oranges', 'pears', 'apricots']
change = [1, 'pennies', 2, 'dimes', 3, 'quarters']

#this first kind of for-loop through a list
for number in the_count:
    print("This is count %d" % number)

#same as above
for fruit in fruits:
    print("A fruit of types: %s" % fruit)

#also we can go through mixed lists too
#notice we have to use %r since we don't know what's in it
for i in change:
    print("I got %r" % i)

#we can also build lists. first start with an empty one
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)
    #appent is a function that lists understand
    elements.append(i)

#now we can print them out too
for i in  elements:
    print("Element was: %d" % i)

习题33 While循环

尽量少用While-loop 多用 For-loop

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)