Question

这是我需要的代码的完整示例我已经使用示例文本文件编辑了完整的帖子输入和输出

文字档案： -

Mohammed
Ahmed
Mansour
Sami
Sameer
Ukhlof
Asfar
Virus
Ameer
AbuAlameer
Ismail
Belal
Heba
Mama
Papa

示例输入： -

Enter a name : Ukhlof
Enter How much names you want to copy before that name : 10

输出：

From Up :-
Mohammed
Ahmed
Mansour
Sami
Sameer
Ukhlof

From Down :-
Belal
Heba
Mama
Papa

您的代码输出： -

From up:
Mohammed
Ahmed
Mansour
Sami
Sameer
From Down:
Papa

Answer 1

import collections

def get(infilepath, name, n):
    d = collections.deque(maxlen=n)
    with open(infilepath) as infile:
        line = infile.readline()
        lines = 1
        while line:
            word = line.strip()
            if word == name:
                print("From up:")
                for item in d:
                    print(item)
                print(word)
                break
            d.append(word)
            line = infile.readline()
            lines += 1
        print("From Down:")

        if n-lines > 0:
            n -= lines
            d = collections.deque(maxlen=n)
            while word:
                d.append(word)
                word = infile.readline().strip()
                if not word:
                    break
            for word in d:
                print(word)

用法：

def main():
    name = input("Enter a name: ")
    n = int(input("How many lines? "))
    infilepath = 'blah'
    get(infilepath, name, n)

输入文件：

Mohammed
Ahmed
Mansour
Sami
Sameer
Ukhlof
Asfar
Virus
Ameer
AbuAlameer
Ismail
Belal
Heba
Mama
Papa

输出：

In [184]: main()
Enter a name: Ukhlof
How many lines? 10
From up:
Mohammed
Ahmed
Mansour
Sami
Sameer
Ukhlof
From Down:
Belal
Heba
Mama
Papa

Python从文本文件中复制特定行

1 个答案: