笨办法学python习题32 循环和列表
2017-12-04 22:21
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列表:list,以【】开始和结尾,中括号中可以存放字符串、数字等。例如 hair = ['brown', 'blond', 'red'] weights = [1, 2, 3, 4 ]
这个习题中我们将学习到以下内容:
列表的应用,
for循环的使用方法,
range函数
字符串的append方法。
先上代码:
the_count = [1, 2, 3, 4, 5]
fruits = ['apple', 'oranges', 'pears', 'apricots']
change = [1, 'pennies', 2, 'dimes', 3, 'quarters']
#this first kind of for-loop goes 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 type:%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
#append 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首先是for循环的使用方法:如果符合判断条件继续循环,一旦出现不符合循环的条件则跳出循环
2,range函数:range(start, stop,[,step])
start: 计数从 start 开始。默认是从 0 开始。例如range(5)等价于range(0, 5);
end: 计数到 end 结束,但不包括 end。例如:range(0, 5) 是[0, 1, 2, 3, 4]没有5
step:步长,默认为1。例如:range(0, 5) 等价于 range(0, 5, 1)
3,使用help(list.append)看到append的作用:
L.append(object) -- append object to end
这个习题中我们将学习到以下内容:
列表的应用,
for循环的使用方法,
range函数
字符串的append方法。
先上代码:
the_count = [1, 2, 3, 4, 5]
fruits = ['apple', 'oranges', 'pears', 'apricots']
change = [1, 'pennies', 2, 'dimes', 3, 'quarters']
#this first kind of for-loop goes 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 type:%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
#append 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首先是for循环的使用方法:如果符合判断条件继续循环,一旦出现不符合循环的条件则跳出循环
2,range函数:range(start, stop,[,step])
start: 计数从 start 开始。默认是从 0 开始。例如range(5)等价于range(0, 5);
end: 计数到 end 结束,但不包括 end。例如:range(0, 5) 是[0, 1, 2, 3, 4]没有5
step:步长,默认为1。例如:range(0, 5) 等价于 range(0, 5, 1)
3,使用help(list.append)看到append的作用:
L.append(object) -- append object to end
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