假设我有一个充满昵称的文本文件。如何使用Python从这个文件中删除特定的昵称?
当前回答
你想从文件中删除特定的行,所以使用这个简短的代码片段,你可以很容易地删除任何带有句子或前缀(符号)的行。
with open("file_name.txt", "r") as f:
lines = f.readlines()
with open("new_file.txt", "w") as new_f:
for line in lines:
if not line.startswith("write any sentence or symbol to remove line"):
new_f.write(line)
其他回答
也许你已经有了正确答案,但下面是我的答案。 我没有使用列表来收集未经过滤的数据(readlines()方法所做的),而是使用了两个文件。一个用于保存主数据,第二个用于在删除特定字符串时过滤数据。这是一个代码:
main_file = open('data_base.txt').read() # your main dataBase file
filter_file = open('filter_base.txt', 'w')
filter_file.write(main_file)
filter_file.close()
main_file = open('data_base.txt', 'w')
for line in open('filter_base'):
if 'your data to delete' not in line: # remove a specific string
main_file.write(line) # put all strings back to your db except deleted
else: pass
main_file.close()
希望你会发现这有用!:)
将文件行保存在一个列表中,然后从列表中删除要删除的行,并将剩余的行写入一个新文件
with open("file_name.txt", "r") as f:
lines = f.readlines()
lines.remove("Line you want to delete\n")
with open("new_file.txt", "w") as new_f:
for line in lines:
new_f.write(line)
首先,打开文件并从文件中获取所有的行。然后以写模式重新打开文件,写回你想要删除的行:
with open("yourfile.txt", "r") as f:
lines = f.readlines()
with open("yourfile.txt", "w") as f:
for line in lines:
if line.strip("\n") != "nickname_to_delete":
f.write(line)
您需要去掉比较中的换行符(“\n”),因为如果您的文件不以换行符结束,那么最后一行也不会以换行符结束。
按行号删除文件中的某一行。
用文件名和要删除的行号替换变量filename和line_to_delete。
filename = 'foo.txt'
line_to_delete = 3
initial_line = 1
file_lines = {}
with open(filename) as f:
content = f.readlines()
for line in content:
file_lines[initial_line] = line.strip()
initial_line += 1
f = open(filename, "w")
for line_number, line_content in file_lines.items():
if line_number != line_to_delete:
f.write('{}\n'.format(line_content))
f.close()
print('Deleted line: {}'.format(line_to_delete))
示例输出:
Deleted line: 3
如果您使用Linux,可以尝试以下方法。 假设你有一个名为animal.txt的文本文件:
$ cat animal.txt
dog
pig
cat
monkey
elephant
删除第一行:
>>> import subprocess
>>> subprocess.call(['sed','-i','/.*dog.*/d','animal.txt'])
然后
$ cat animal.txt
pig
cat
monkey
elephant