Python 3 - 将列表中的数字乘以2

时间:2018-04-11 17:46:34

标签: python python-3.x list

我要求完成的代码的目的是接收给定库存的输入,将它们返回到一行中的列表中。然后在第二行,复制列表,但这次加倍数字。

给定的输入是

Choc 5; Vani 10; Stra 7; Choc 3; Stra 4

所需的输出是:

[['Choc', 5], ['Vani', 10], ['Stra', 7], ['Choc', 3], ['Stra', 4]]
[['Choc', 10], ['Vani', 20], ['Stra', 14], ['Choc', 6], ['Stra, 8]]

我成功地为第一线获得了所需的输出,但我正在努力争取如何成功地与第二线竞争。

这是代码:

def process_input(lst):
    result = []
    for string in lines:
        res = string.split()
        result.append([res[0], int(res[1])])
    return result

def duplicate_inventory(invent):
    # your code here
    return = []
    return result

# DON’T modify the code below
string = input()
lines = []
while string != "END":
    lines.append(string)
    string = input()
inventory1 = process_input(lines)
inventory2 = duplicate_inventory(inventory1)
print(inventory1)
print(inventory2)

3 个答案:

答案 0 :(得分:9)

由于你已经完成了第一行,你可以使用一个简单的列表理解来获得第二行:

x = [[i, j*2] for i,j in x]
print(x)

输出:

[['Choc', 10], ['Vani', 20], ['Stra', 14], ['Choc', 6], ['Stra', 8]]

答案 1 :(得分:0)

如果您希望避免使用显式循环,以下是常用的单行代码:

x = 'Choc 5; Vani 10; Stra 7; Choc 3; Stra 4'

res1 = [[int(j) if j.isdigit() else j for j in i.split()] for i in x.split(';')]
res2 = [[int(j)*2 if j.isdigit() else j for j in i.split()] for i in x.split(';')]

print(res1)
print(res2)

# [['Choc', 5], ['Vani', 10], ['Stra', 7], ['Choc', 3], ['Stra', 4]]
# [['Choc', 10], ['Vani', 20], ['Stra', 14], ['Choc', 6], ['Stra', 8]]

答案 2 :(得分:0)

另一种方法

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