This data was generated randomly, but we’ll pretend our employee urgently needs us to complete the comparison. These files contain employee records, including the first name, last name, and email of each employee. Using the csv module, we’ll compare two files of data and identify the lines that don’t match. By using the csv module, we can quickly access the data within a csv file. Python provides tools for working with these files as well. csv Files in Python Line by LineĬomma separated value files are used for exchanging data between programs. The unified_diff() function also provides some context about the differences found. Looking at the output, we can see that the difflib module does much more than compare text files line by line. With open("student_gpa_2020.txt",'r') as file2:įile1_contents, file2_contents, fromfile="file1.txt", Patrick Nelson 2.1 Example: Comparing Student GPA’s import difflib By using the Python with statement, we can safely open and read files. The following example makes use of the with statement to read the file data. We can do this using the unified_diff() function. Secondly, we’ll compare these student records and examine how the student’s grades change from the years 2019 through 2020. These files contain the information for fictitious students, including their names and grade point averages. It contains many useful functions for comparing bodies of texts.įirstly, we’ll use the unified_diff() function to pinpoint mismatches between two data files. This Python 3 module comes pre-packaged with the language. The difflib module is useful for comparing texts and finding the differences between them. Example: Compare two files with the filecmp.cmp() import filecmpįile1 = "C:\\Users\jpett\\Desktop\\PythonForBeginners\\2Files\\punctuation1.txt"įile2 = "C:\\Users\jpett\\Desktop\\PythonForBeginners\\2Files\\punctuation2.txt"įile3 = "C:\\Users\jpett\\Desktop\\PythonForBeginners\\2Files\\punctuation3.txt"Ĭompare Two Files Using the difflib Module For this example, a custom function was used to complete the comparison.Īfter we compare the files, we can see if the data matches, Finally, we’ll alert the user to the outcome. We also need to import the os module, which will allow us to load a file using the path in the directory. She’s really into cooking her family and her cats.īefore we can use the filecmp module, we’ll need to import it. I’d like to thank my parents, Janet, and God. She’s really into cooking, her family, and her cats. I’d like to thank my parents, Janet and God. We’ll use the filecmp.cmp() method to compare the files using Python. The first and third are identical, while the second is slightly different. This method will return True if the files match, or False if they don’t. We can do this using the filecmp.cmp() method. Specifically, this module is used to compare data between two or more files. The filecmp module includes functions for working with files in Python. Print("Line " + str(i+1) + " doesn't match.")įile2: Using the filecmp Module to Compare Files Example: Using Python to compare email lists file1 = open("emails_A.txt",'r') We’ll include the data itself so the user can easily track down the different lines. If the lines don’t match, the user receives a message telling them where the mismatch occurred. Once the data is extracted, a for loopis used to compare the files line by line. Using the readlines() method, it’s possible to extract the lines from the text file. These two lists of emails, we’re told, may not be identical. The open() function will look for a file in the local directory and attempt to read it.įor this example, we’ll compare two files that contain email data. We can compare two text files using the open() function to read the data contained in the files.
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