如何在python中从文本文件的特定行打印

我正在使用以下代码搜索特定字符串：

stringToMatch = 'blah'
matchedLine = ''
#get line
with open(r'path of the text file', 'r') as file:
    for line in file:
        if stringToMatch in line:
            matchedLine = line
            break
#and write it to the file
with open(r'path of the text file ', 'w') as file:
    file.write(matchedLine)

---

即使字符串出现多次，也只打印一次。我还想在特定单词出现后打印所有行。如何做到这一点？

设置一个标记以跟踪您何时看到该行，并将该行写入同一循环中的输出文件

string_to_match = "blah"
should_print = False
with open("path of the text file", "r") as in_file, open("path of another text file", "w") as out_file:
    for line in in_file:
        if string_to_match in line:
            # Found a match, start printing from here on out
            should_print = True
        if should_print:
            out_file.write(line)

---

设置一个标记以跟踪何时看到该行，并在同一循环中将这些行写入输出文件

string_to_match = "blah"
should_print = False
with open("path of the text file", "r") as in_file, open("path of another text file", "w") as out_file:
    for line in in_file:
        if string_to_match in line:
            # Found a match, start printing from here on out
            should_print = True
        if should_print:
            out_file.write(line)

---

您可以这样修改代码：-

stringToMatch = 'blah'
matchedLine = ''
#get line
with open(r'path of the text file', 'r') as file:
    for line in file:
        if stringToMatch in line:
            matchedLine += line + '\n'

#and write it to the file
with open(r'path of the text file ', 'w') as file:
    file.write(matchedLine)

---

希望你收到了

您可以这样修改代码：-

stringToMatch = 'blah'
matchedLine = ''
#get line
with open(r'path of the text file', 'r') as file:
    for line in file:
        if stringToMatch in line:
            matchedLine += line + '\n'

#and write it to the file
with open(r'path of the text file ', 'w') as file:
    file.write(matchedLine)

希望你收到了

您的中断表示，一旦发现一个案例，就保留for循环。您可能需要删除/修改它。您的中断表示在找到一个案例后保留for循环。您可能需要删除/修改它。