Python 通过所有输入文件循环任务

我正在尝试计算我提供的所有.txt文件中的所有As、Bs和Cs，并创建一个.csv文件，其中逐个列出这些字母的计数

这里的代码实现了我想要的所有功能，但只使用我提供的最后一个文件，而不是所有文件

我做错了什么

import glob
import csv

#This will print out all files loaded in  the same directory and print them out
for filename in glob.glob('*.txt*'):
    print(filename)

#A B and C
substringA = "A"
Head1 = (open(filename, 'r').read().count(substringA))
substringB = "B"
Head2 = (open(filename, 'r').read().count(substringB))
substringC = "C"
Head3 = (open(filename, 'r').read().count(substringC))
header = ("File", "A Counts" ,"B Counts" ,"C Counts")
analyzed = (filename, Head1, Head2, Head3)

#This will write a file named Analyzed.csv
with open('Analyzed.csv', 'w', newline='') as csvfile:
    writer = csv.writer(csvfile)
    writer.writerow(header)
    writer.writerow(analyzed)

---

缩进丢失，并在追加模式下打开

分析.csv

a

：

import glob
import csv

#This will print out all files loaded in  the same directory and print them out
for filename in glob.glob('*.txt*'):
    print(filename)

    #A B and C
    substringA = "A"
    Head1 = (open(filename, 'r').read().count(substringA))
    substringB = "B"
    Head2 = (open(filename, 'r').read().count(substringB))
    substringC = "C"
    Head3 = (open(filename, 'r').read().count(substringC))
    header = ("File", "A Counts" ,"B Counts" ,"C Counts")
    analyzed = (filename, Head1, Head2, Head3)

    #This will write a file named Analyzed.csv
    with open('Analyzed.csv', 'a') as csvfile:
        writer = csv.writer(csvfile)
        writer.writerow(header)
        writer.writerow(analyzed)

编辑：删除不受支持的

newline=”“

参数您可以尝试以下操作：

from itertools import chain
from collections import Counter
for filename in glob.glob('*.txt*'):
     data = chain.from_iterable([list(i.strip("\n")) for i in open(filename)])

     the_count = Counter(data)
     with open('Analyzed.csv', 'w', newline='') as csvfile:
         writer = csv.writer(csvfile)
         writer.writerow(filename)
         writer.writerow("A count: {}".format(the_count["A"]))
         writer.writerow("B count: {}".format(the_count["B"]))
         writer.writerow("C count: {}".format(the_count["C"]))

---

您还需要做另一个小改动：您需要以追加的形式打开，而不是写入，以及缩进。请注意，当您以附加方式打开时，不会覆盖以前存在的任何内容，因此我添加了顶部的部分以删除csv中已有的任何内容

import glob
import csv


#This will delete anything in Analzyed.csv if it exists and replace it with the header
with open('Analyzed.csv','w') as csvfile:
    writer = csv.writer(csvfile)
    header = ("File", "A Counts" ,"B Counts" ,"C Counts")
    writer.writerow(header)

for filename in glob.glob('*.txt*'):
    print(filename)

    #A B and C
    substringA = "A"
    Head1 = (open(filename, 'r').read().count(substringA))
    substringB = "B"
    Head2 = (open(filename, 'r').read().count(substringB))
    substringC = "C"
    Head3 = (open(filename, 'r').read().count(substringC))
    header = ("File", "A Counts" ,"B Counts" ,"C Counts")
    analyzed = (filename, Head1, Head2, Head3)

    #This will write a file named Analyzed.csv
    with open('Analyzed.csv', 'a', newline='') as csvfile:
        writer = csv.writer(csvfile)
        writer.writerow(analyzed)

以上是我的解决方案，使尽可能多的代码保持不变。但是，理想情况下，您只需在文件开头打开一次文件。这是您将如何做到的：

import glob
import csv


with open('Analyzed.csv','w') as csvfile:
    writer = csv.writer(csvfile)
    header = ("File", "A Counts" ,"B Counts" ,"C Counts")
    writer.writerow(header)

    for filename in glob.glob('*.txt*'):
        print(filename)

        #A B and C
        substringA = "A"
        Head1 = (open(filename, 'r').read().count(substringA))
        substringB = "B"
        Head2 = (open(filename, 'r').read().count(substringB))
        substringC = "C"
        Head3 = (open(filename, 'r').read().count(substringC))
        analyzed = (filename, Head1, Head2, Head3)

        writer.writerow(analyzed)

---

正在计数的代码

A

B

和

C

是在for循环中还是在for循环之外？只要将计数代码向右移动4个空格，它就会在

for

循环中：）我想这正是我的问题。我不知道如何循环计算所有文件的代码。将覆盖已分析的文件。TXT您必须在for之前打开输出文件，或者以追加模式打开它（但它不会删除以前的运行数据）。我将其更改为以追加模式打开

a

，非常感谢。这很有效。如何避免它多次写入表头。writer.writerow（header）只是第一次这样做。哎呀，我没有注意到这一部分，我将添加一个补丁