假设我有一个txt文件，如下所示：
Line 1
Line 2
Line 3
a = input("text to delete from file: ")
with open('save.txt', 'r') as file:
text = file.read()
with open('save.txt', 'w') as file:
new_text = text.replace(a, '')
file.write(new_text)
用户在a变量上输入第2行后，txt文件如下：
Line 1
whitespace/empty line
Line 3
如何删除空行？
将输入拆分为行列表。删除与用户输入匹配的行，然后将它们重新连接在一起。
a = input("text to delete from file: ")
with open('save.txt', 'r') as file:
text = file.read().splitlines()
new_text = [line for line in text if line != a]
with open('save.txt', 'w') as file:
file.write('\n'.join(new_text) + '\n')
删除换行符以及用户的文本。
new_text = text.replace(a + '\n', '')
This will save the text with no empy line to the variable final_text.
line_to_delete = "fifth line"
with open("data/test.txt") as file:
text = file.read()
print(text)
text2 = text.replace(line_to_delete, "")
text3 = [text for text in text2.splitlines() if text]
final_text = " \n".join(text3)
print(final_text)
