python3删除变量中的行

lines = ['line 1', 'line 2', 'line 3', 'line 4']
del lines[2]  # 删除第3行
print(lines)  # 输出：['line 1', 'line 2', 'line 4']

lines = ['line 1', 'line 2', 'line 3', 'line 4']
lines = [line for line in lines if line != 'line 3']  # 删除第3行
print(lines)  # 输出：['line 1', 'line 2', 'line 4']

lines = ['line 1', 'line 2', 'line 3', 'line 4']
deleted_line = lines.pop(2)  # 删除第3行
print(deleted_line)  # 输出：'line 3'
print(lines)  # 输出：['line 1', 'line 2', 'line 4']