Python-追加和排序列表 [英] Python - Appending and Sorting a List

问题描述

我正在尝试从命令行获取argv(i，w或f)的代码.然后使用输入，我要获取一个整数列表，浮点数或单词并执行一些操作.

I'm working on a code where I'm trying to take a argv (i, w or f) from the command line. Then using input, I want to take a list of integers, float or words and execute a few things.

1. 用户将在命令行上输入'f'，然后输入浮点列表，这些浮点值将附加到一个空列表中.然后程序将对float列表进行排序并打印输出结果.

我想要类似的单词和整数.

I want to similar for words and integers.

如果输入是单词列表，则输出将按字母顺序打印单词.如果输入是整数列表，则输出将是相反顺序的列表.

If the input is a list of words, the output will print words in alphabetize order. If the input is a list of integers, the output will be the list in the reverse order.

这是我到目前为止的代码，但是到目前为止，一些输入值只是将这些值附加到空列表中.我缺少什么阻止了代码正常执行?

This is the code that I have so far, but as of right now some of the input values are just appending the values to the empty list. What am I missing that is preventing the code to execute properly?

例如，程序将以添加程序名称和单词"w"开头:

for example, program will start by adding program name and 'w' for word:

$ test.py w
>>> abc ABC def DEF
[ABC, DEF,abc,def] # list by length, alphabetizing words 

代码

import sys, re

script, options = sys.argv[0], sys.argv[1:]

    a = [] 

    for line in options: 

        if re.search('f',line):     # 'f' in the command line
            a.append(input()) 
            a.join(sorted(a)) # sort floating point ascending 
            print (a)  


        elif re.search('w', line):              
            a.append.sort(key=len, reverse=True) # print list in alphabetize order
            print(a) 

        else: re.search('i', line)
        a.append(input())   
        ''.join(a)[::-1]  # print list in reverse order
        print (a)  

推荐答案

尝试一下:

import sys
option, values = sys.argv[1], sys.argv[2:]

tmp = {
       'i': lambda v: map(int, v),
       'w': lambda v: map(str, v),
       'f': lambda v: map(float, v)
      }
print(sorted(tmp[option](values)))

输出:

shell$ python my.py f 1.0 2.0 -1.0
[-1.0, 1.0, 2.0]
shell$ 

shell$ python my.py w aa bb cc
['aa', 'bb', 'cc']
shell$ 

shell$ python my.py i 10 20 30
[10, 20, 30]
shell$ 

您将必须添加必要的错误处理.例如，

You'll have to add necessary error handling. For e.g,

 >>> float('aa')
 Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
 ValueError: could not convert string to float: aa
 >>> 

这篇关于Python-追加和排序列表的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！