How To Search For A String In Text Files With Python

The aim of this playbook🏁 is to learn how text is to be quickly matched in text files with python

1. steps

1. open file with with open(<fileName>, <mode>, <encoding>) as fileAlias
2. write a predicate expression with <string>, in operator and fileAlias.read()

with open('example.txt', mode='rt', encoding='utf-8') as f:
    if 'example' in f.read():
        print("true")

2. example

• I run unit tests with this checking if the item is deleted properly from an index file (a manifest table of the knowledge base)

def test_delIndexItem():
    inpt = "01.03"
    delPubItem(docID=inpt)
    with open("index.yaml", mode="rt", encoding="utf-8") as indexFile:
        fl = indexFile.read()
    result = True if inpt in fl else False
    assert result == False

3. sources

• python -? — Stack Overflow