计数在python

  • Z时代
  • 2024-01-10
  • 分类：问答

文件的某些价值观我有这样一个文本文件（这是一个样本，在非常大的实际文件）：计数在python

[52639 - 2017-12-08 11:56:58,680] INFO __main__.master 251 Finished pre-smap protein tag ('4h02', [], 35000, 665, '67') 
[52639 - 2017-12-08 11:57:37,686] INFO __main__.master 251 Finished pre-smap protein tag ('4nqk', [], 35000, 223, '18') 
[52639 - 2017-12-08 11:58:46,984] INFO __main__.master 251 Finished pre-smap protein tag ('3j60', [], 3500, 1052, '65') 
[52639 - 2017-12-08 12:01:10,073] INFO __main__.master 251 Finished pre-smap protein tag ('4ddg', [], 35000, 541, '38') 
[52639 - 2017-12-08 12:03:37,570] INFO __main__.master 251 Finished pre-smap protein tag ('4ksl', [], 35000, 1303, '68')

，我想最后一个逗号前计数的值。结果将是665 + 223 + 1052 + 541 + 1303 = 3784.

我想不出如何实现这一点。任何帮助将不胜感激。

回答：

在这里，你可以试试这个：

summation = 0 
with open("test.txt", "r") as infile: 
    for line in infile: 
     newLine = line.split(", ") 
     summation = summation + int(newLine[3]) 
print(summation)

输出：

3784

test.txt文件的内容结构是这样的：

[52639 - 2017-12-08 11:56:58,680] INFO main.master 251 Finished pre-smap protein tag ('4h02', [], 35000, 665, '67') 
[52639 - 2017-12-08 11:57:37,686] INFO main.master 251 Finished pre-smap protein tag ('4nqk', [], 35000, 223, '18') 
[52639 - 2017-12-08 11:58:46,984] INFO main.master 251 Finished pre-smap protein tag ('3j60', [], 3500, 1052, '65') 
[52639 - 2017-12-08 12:01:10,073] INFO main.master 251 Finished pre-smap protein tag ('4ddg', [], 35000, 541, '38') 
[52639 - 2017-12-08 12:03:37,570] INFO main.master 251 Finished pre-smap protein tag ('4ksl', [], 35000, 1303, '68')

如果你想打印所有的数字，使得总和，你可以使用一个列表来存储每个数字：

summation = 0 
coefficients = [] 
with open("test.txt", "r") as infile: 
    for line in infile: 
     newLine = line.split(", ") 
     coefficients.append(newLine[3]) 
     summation = summation + int(newLine[3]) 
print("+".join(coefficients), end="=") 
print(summation)

输出：

665+223+1052+541+1303=3784

回答：

import re 
s = """ 
[52639 - 2017-12-08 11:56:58,680] INFO main.master 251 Finished pre-smap protein tag ('4h02', [], 35000, 665, '67') 
[52639 - 2017-12-08 11:57:37,686] INFO main.master 251 Finished pre-smap protein tag ('4nqk', [], 35000, 223, '18') 
[52639 - 2017-12-08 11:58:46,984] INFO main.master 251 Finished pre-smap protein tag ('3j60', [], 3500, 1052, '65') 
[52639 - 2017-12-08 12:01:10,073] INFO main.master 251 Finished pre-smap protein tag ('4ddg', [], 35000, 541, '38') 
[52639 - 2017-12-08 12:03:37,570] INFO main.master 251 Finished pre-smap protein tag ('4ksl', [], 35000, 1303, '68') 
""" 
pattern = ', ([0-9]*), \'[0-9]*\'\)' 
print sum(int(i) for i in re.findall(pattern,s))

您是否尝试过使用正则表达式库？通过构建一个与“用括号关闭的数字之前的数字”匹配的模式，可以捕获所有这些数字，然后构建一个将它们转换为整数的生成器，并将它们相加。

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