试图删除包含特定字符的文本文件中的行

使用三元运算符怎么样?

 #First option: within your for loop
 line = "" if "#" in line or not line else line

 #Second option: with list comprehension
 newFile = ["" if not line or "#" in line else line for line in oldfile]

我不确定三元是否有效,因为如果字符串为空,则应显示异常,因为“”不在空字符串中…怎么样

#Third option: "Staging your conditions" within your for loop
#First, make sure the string is not empty
if line:
    #If it has the "#" char in it, delete it
    if "#" in line:
        line = ""
#If it is, delete it
else: 
    line = ""

这很容易。请检查下面的代码:

filePath = "your old file path"
newFilePath = "your new file path"

# we are going to list down which lines start with "#" or just blank
marker = []

with open(filePath, "r") as file:
    content = file.readlines() # read all lines and store them into list

for i in range(len(content)): # loop into the list
    if content[i][0] == "#" or content[i] == "\n": # check if the line starts with "#" or just blank
        marker.append(i) # store the index into marker list

with open(newFilePath, "a") as file:
    for i in range(len(content)): # loop into the list
        if not i in marker: # if the index is not in marker list, then continue writing into file
            file.writelines(content[i]) # writing lines into file

关键是,我们需要先读所有的行。并逐行检查是否以 # 或者只是空白。如果是,则将其存储到列表变量中。之后,我们可以通过检查行的索引是否在marker中继续写入新文件。

如果有问题请告诉我。