Chris To convert a Microsoft Acces table (.accdb) to a CSV file in Python, use the following four steps: Establish database connection, Run the SQL query to select data, Store the data in the CSV using basic Python file I/O and the csv module, and Close the database connection. Here’s a specific example with additional annotations … Read more
You can merge multiple text files to a single CSV file in Python by using the glob.glob(‘./*.txt’) expression to filter out all path names of text files in a given folder. Then iterate over all those path names and use the open() function to read the file contents and write append them to the CSV. … Read more
You can convert a text file to a CSV file in Python in four simple steps: (1) Install the Pandas library, (2) import the Pandas library, (3) read the CSV file as DataFrame, and (4) write the DataFrame to the file: (Optional in shell) pip install pandas import pandas as pd df = pd.read_csv(‘my_file.txt’) df.to_csv(‘my_file.csv’, … Read more
💬 Question: How to convert an .avro file to a .csv file in Python? Solution: To convert an Avro file my_file.avro to a CSV file my_file.csv, create a CSV writer using the csv module and iterate over all rows using the iterator returned by fastavro.reader(). Then write each row to a file using the writerow() … Read more
for i j in python The Python expression for i, j in XXX allows you to iterate over an iterable XXX of pairs of values. For example, to iterate over a list of tuples, this expression captures both tuple values in the loop variables i and j at once in each iteration. Here’s an example: … Read more
Problem Formulation 💬 Challenge: How to design a regular expression pattern that matches whitespace characters such as the empty space ‘ ‘ and the tabular character ‘\t’, but not the newline character ‘\n’? An example of this would be to replace all whitespaces (except newlines) between a space-delimited file with commas to obtain a CSV. … Read more
The easiest way to convert a space-delimited file to a comma-separated values (CSV) file is to use the following three lines of code: import pandas as pd df = pd.read_csv(‘my_file.txt’, sep=’\s+’, header=None) df.to_csv(‘my_file.csv’, header=None) We’ll explain this and other approaches in more detail next—scroll down to Method 3 for this exact method. Problem Formulation Given … Read more
Wrong Way to Create and Initialize a List of Lists in Python A standard way to initialize a flat list in Python is the multiplication operator to create a new list by repeatedly concatenating an existing list: 🌍 Related Tutorial: How to create a list in Python? Consequently, many beginner coders try to use the … Read more
How to write a NumPy array to a CSV file in Python? To write a NumPy array to a CSV file, use the np.savetxt() function and pass the filename as a string, as well as the array into it. Optionally, you can specific the file format, the delimiter such as comma or semicolon, and other … Read more
💬 Question: How to convert a list of custom objects to a csv file? Example: Given is a list of custom objects of, say, type Employee that holds the name, job description, and income like so: Your goal is to write the content of the list of objects into a comma-separated-values (CSV) file format. Your … Read more
This tutorial gives you a simple introduction to Python’s NumPy library. You don’t need any prerequisites to follow the tutorial. My goal was to give a practical and fun NumPy introduction for absolute beginners with many examples. 💡 By reading through this tutorial, you will gain a basic understanding of the most important NumPy functionality. … Read more
Are you interested in Python but you don’t know which Python library is most attractive from a career point of view? Well, you should focus on the library you’re most excited about. But if you’re generally open because you have multiple passions, it would be reasonable to also consider annual and hourly income. These are … Read more