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I want to check if a string is in a text file. If it is, do X. If it's not, do Y. However, this code always returns True for some reason. Can anyone see what is wrong? def check(): datafile = file('example.txt') found = False. for line in datafile: if blabla in line: found = True. break. check() if True: print "true" else: print "false" python.
14 Μαρ 2023 · In this article, we are going to see how to search for a string in text files using Python. Example: string = “GEEK FOR GEEKS” Input: “FOR” Output: Yes, FOR is present in the given string. Text File for demonstration: myfile.txt. Finding the index of the string in the text file using readline ()
In this quiz, you'll check your understanding of the best way to check whether a Python string contains a substring. You'll also revisit idiomatic ways to inspect the substring further, match substrings with conditions using regular expressions, and search for substrings in pandas.
1 Φεβ 2022 · def search_str (file_path, word): with open(file_path, 'r') as file: # read all content of a file content = file.read() # check if string present in a file if word in content: print('string exist in a file') else: print('string does not exist in a file') search_str(r'E:\demos\files_demos\account\sales.txt', 'laptop') Code language: Python (python)
3 Φεβ 2009 · You can use 2 methods from the String class. String.contains() which checks if the string contains a specified sequence of char values; String.indexOf() which returns the index within the string of the first occurence of the specified character or substring or returns -1 if the character is not found (there are 4 variations of this method ...
The contains() method checks whether a string contains a sequence of characters. Returns true if the characters exist and false if not. Syntax. public boolean contains(CharSequence chars) Parameter Values. The CharSequence interface is a readable sequence of char values, found in the java.lang package. Technical Details. String Methods.
8 Ιαν 2024 · In this tutorial, we’ll review several ways of checking if a String contains a substring, and we’ll compare the performance of each. 2. String.indexOf. Let’s first try using the String.indexOf method. indexOf gives us the first position where the substring is found, or -1 if it isn’t found at all.
