如何格式化文本文件以删除空白文件和尾随空格答案

【问题标题】：How to format a text file such that it removes blank files and trailing space如何格式化文本文件以删除空白文件和尾随空格
【发布时间】：2020-07-02 15:59:37
【问题描述】：

我有像截图一样的test.txt

PS：第二行有尾随空格，所以是 line 2

结果我们必须得到：

第 1 行
第 2 行
第 3 行

这是我目前所拥有的

with open("test", 'r+') as fd:
    lines = fd.readlines()
    fd.seek(0)
    fd.writelines(line for line in lines if line.strip())
    fd.truncate()

但它不处理行以空格开头的情况（在示例中为第 2 行），我该如何修改我的代码？我要我们Python

【问题讨论】：

标签： python text nlp

【解决方案1】：

Test.txt 文件：

first line

     second line
third line

Python 代码：

#// Imports
import os
#// Global Var's
fileName:str = "test.txt"

#// Logic
def FileCorection(file:str):
    try:
        #// Read original file
        with open(file, "r") as r:
            #// Write a temporary file
            with open(f"temp_{file}", "w") as w:
                # Get line from original file
                line = r.readline()

                # While we still have lines
                while line:
                    # Make a temporary line with out spaces at the end and also at the front of the line (in case they are)
                    tempLine:str = line.strip()
                    #// Check if the line is empty
                    if tempLine == "":
                        Line:tuple = (False, "Empty line...")
                    #// If not then get the line
                    else:
                        Line:tuple = (True, tempLine)

                    #// Print/Show Line if is True... in this case you care set witch line to pre writed in a new file
                    if Line[0] == True:
                        print(Line[1])
                        w.write(f"{Line[1]}\n")

                    line = r.readline()
    finally:
        # Make shore the files are closed
        # By default they shood but just to make shore
        r.close()
        w.close()

        # Now repalce the temp file with the original one
        # By replaceing we delete the original one and we rename the temporary one with the same name
        os.remove(file)
        os.rename(f"temp_{file}", file)

if __name__ == "__main__":
    FileCorection(fileName)
    # Show when is done
    print(">> DONE!")

控制台输出：

first line
second line
third line
>> DONE!

Process finished with exit code 0

P.S.：代码已更新/优化！

【讨论】：

我还想用新格式更新我的 test.txt。我们将不得不将输出写入文本文件。你也可以帮忙吗
@AayushGupta 完成 :)
@AayushGupta 我通过删除 useles 代码更新了代码，并添加了更多 cmets 来解释这行代码的含义:)

【解决方案2】：

我建议格式化输入（文本文件的屏幕截图可以）。假设您的输入看起来像这样，您可以在文本以空格开头时使用 strip。

#Code
with open(r"demo.txt","r") as f:
    data = f.read()

data_list = [s.strip() for s in data.split("\n") if len(s)>0]
print("\n".join(data_list))

【讨论】：

我已按要求添加截图