如何使用 python 从特定关键字中提取有限的数据行

Question

我有一个文本文件，我需要提取段落中出现指定关键字的前五行。

我能够找到关键字，但无法根据该关键字写下五行。

mylines = []                              

with open ('D:\Tasks\Task_20\txt\CV (4).txt', 'rt') as myfile:  

    for line in myfile:                   

        mylines.append(line)             

    for element in mylines:               

        print(element, end='')  

print(mylines[0].find("P"))

如果有人对此有任何想法，请提供帮助。

输入文本文件示例：-

菲律宾合作机构：ALL POWER STAFFING SOLUTIONS, INC.

培训 Objectives: : 拥有国际文化接触和该领域的实践经验酒店管理作为通往有意义的酒店职业的门户。培养我的待客之道管理技能并具有全球竞争力。

教育机构名称： SOUTHVILLE FOREIGN UNIVERSITY - PHILIPPINES Location Hom as Pinas City, Philippine Institution 开始日期：（2007 年 6 月

要求输出：-

培训 Objectives: : 拥有国际文化接触和该领域的实践经验酒店管理作为通往有意义的酒店职业的门户。培养我的待客之道管理技能并具有全球竞争力。

#

我必须在文本文件中搜索 Training Objective 关键字，它发现应该只写下 5 行。

Answer 1

试试这个：

with open('test.txt') as f:
    content = f.readlines()
index = [x for x in range(len(content)) if 'training objectives' in content[x].lower()]
for num in index:
    for lines in content[num:num+5]:
        print (lines)

如果你只有几个字（只是为了获取索引）：

index = []
for i, line in enumerate(content):
    if 'hello' in line or 'there' in line:     //add your or + word here
        index.append(i)
print(index)

如果你有很多（只是为了获取索引）：

list = ["hello","there","blink"]    //insert your words here
index = []
for i, line in enumerate(content):
    for items in list:
        if items in line:
            index.append(i)
print(index)

Answer 2

这取决于你\n 的位置，但我将一个正则表达式放在一起可能有助于我的文本在变量 st 中的外观示例：

In [254]: st                                                                                  

Out[254]: 'Philippine Partner Agency: ALL POWER STAFFING SOLUTIONS, INC.\n\nTraining Objectives::\nTo have international cultural exposure and hands-on experience \nin the field of hospitality management as a gateway to a meaningful hospitality career. \nTo develop my hospitality management skills and become globally competitive.\n\n\nEducation Institution Name: SOUTHVILLE FOREIGN UNIVERSITY - PHILIPPINES Location Hom as Pinas City, Philippine Institution start date: (June 2007\n'

impore re

re.findall('Training Objectives:.*\n((?:.*\n){1,5})', st)   

Out[255]: ['To have international cultural exposure and hands-on experience \nin the field of hospitality management as a gateway to a meaningful hospitality career. \nTo develop my hospitality management skills and become globally competitive.\n\n\n']

Answer 3

如果您只是想提取整个 "Training Objectives" 块，请查找关键字并继续追加行，直到遇到空行（或其他合适的标记，下一个 header例如）。

（已编辑以处理多个文件和关键字）

def extract_block(filename, keywords):
    mylines = []
    with open(filename) as myfile:
        save_flag = False
        for line in myfile:
            if any(line.startswith(kw) for kw in keywords):
                save_flag = True
            elif line.strip() == '':
                save_flag = False
            if save_flag:
                mylines.append(line)
    return mylines

filenames = ['file1.txt', 'file2.txt', 'file3.txt']
keywords = ['keyword1', 'keyword2', 'keyword3']
for filename in filenames:
    block = extract_block(filename, keywords)

这假设每个文件中只有 1 个块。如果您从每个文件中提取多个块，它会变得更加复杂。

如果你真的想要 5 行，始终和每次，那么你可以做类似的事情，但添加一个计数器来计算你的 5 行。

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