Read and write Text, JSON, and CSV files in Python

Read and write Text, JSON, and CSV files in Python
Photo by Johannes Plenio / Unsplash

Python is widely recognized as a high-level programming language, lauded for its simplicity and readability. It enjoys extensive usage across diverse domains, including web development, data analysis, artificial intelligence, and scientific computing.

Python's syntax empowers programmers to compose code that is clear and concise, making it an ideal choice for both novices and seasoned developers.

Why Python is an ideal programming language for students.

Python stands out as a popular language among students due to its gentle learning curve and abundant learning resources available for practice and mastery. Its syntax closely resembles natural language, enabling students to comprehend and construct code with ease. Moreover, Python boasts a thriving community of developers who actively contribute libraries and frameworks tailored explicitly for educational purposes.

Students can leverage Python for a multitude of use cases, including:

  • Web Development: Python offers frameworks like Django and Flask, streamlining the process of building web applications. These frameworks provide an array of tools and libraries for handling essential aspects such as routing, database interactions, and user authentication.
  • Data Analysis: Python's libraries, such as NumPy, Pandas, and Matplotlib, furnish powerful resources for data manipulation, analysis, and visualization. Students can employ these libraries to explore and scrutinize datasets, perform intricate statistical calculations, and create visually captivating representations.
  • Artificial Intelligence: Python plays a pivotal role in the field of artificial intelligence and machine learning. Libraries like TensorFlow and PyTorch equip students with indispensable capabilities to construct and train neural networks for tasks such as image recognition, natural language processing, and predictive modeling.
  • Scientific Computing: Python's extensive scientific libraries, including SciPy and scikit-learn, make it a preferred option for scientific computing. Students can harness these libraries to tackle diverse tasks like solving differential equations, conducting numerical simulations, and performing comprehensive statistical analyses.

Besides these prominent use cases, Python finds utility in automation, scripting, game development, and much more. Its versatility and user-friendly nature render it an invaluable skill for students pursuing various disciplines.

In conclusion, Python's simplicity, readability, and extensive ecosystem of libraries and frameworks establish it as an exceptional choice for students and developers of all expertise levels. Whether embarking on the journey of programming or undertaking intricate projects, Python equips individuals with the indispensable tools and resources needed to excel.

In this tutorial, you will find code snippets in how to read and write, also convert text-based file that include Text, CSV, and JSON files.

How to read a text file.

To read a file, you can use the open() function. Here's a cod example:

file = open("example.txt", "r")
content = file.read()
print(content)
file.close()

In this example, we open the file named "example.txt" in read mode ("r"), read its content using the read() method, and then print the content. Finally, we close the file using the close() method.

Write a Text file

To write to a file, you can use the open() function with write mode ("w"). In this example, we open the file named "example.txt" in write mode ("w"), write the text "This is some text." to the file using the write() method, and then close the file.

file = open("example.txt", "w")
file.write("This is some text.")
file.close()

Remember to always close the file after reading or writing to it to free up system resources.

Read and Write JSON file

To manipulate JSON files in Python, confidently utilize the JSON module.

import json

Read JSON file

Below are examples demonstrating the process of reading and writing JSON files:

import json

# Open the JSON file
with open("data.json", "r") as file:
    # Load the JSON data
    data = json.load(file)

# Access the data
print(data)

In this example, we confidently open the file named "data.json" in read mode and expertly use the json.load() function to skillfully load the JSON data into a Python object. With our expertise, we can effortlessly access and work with the data as required.

Write JSON file

In this example, we create a Python object data that holds information. Next, we open the file "data.json" in write mode and use the json.dump() function to write the JSON data from the Python object to the file.

import json

# Create a Python object
data = {
    "name": "John Doe",
    "age": 30,
    "city": "New York"
}

# Open the JSON file
with open("data.json", "w") as file:
    # Write the JSON data
    json.dump(data, file)

Reading and Writing CSV Files

If you want to deal with CSV files in Python, you can totally go for the csv module.

Read CSV file

In the following example, we open the file named "data.csv" in read mode and use the csv.reader() function to create a CSV reader object. We can then iterate over each row in the CSV file and access the data in each row.

import csv

# Open the CSV file
with open("data.csv", "r") as file:
    # Create a CSV reader
    reader = csv.reader(file)

    # Iterate over each row in the CSV file
    for row in reader:
        # Access the data in each row
        print(row)

Write CSV file

In this following code snippet, we create a list data containing rows of data. We then open the file named "data.csv" in write mode and use the csv.writer() function to create a CSV writer object. We can then write each row of data to the CSV file using the writerow() method.

import csv

# Create a list of data
data = [
    ["Name", "Age", "City"],
    ["John Doe", 30, "New York"],
    ["Jane Smith", 25, "Los Angeles"]
]

# Open the CSV file
with open("data.csv", "w", newline="") as file:
    # Create a CSV writer
    writer = csv.writer(file)

    # Write the data to the CSV file
    for row in data:
        writer.writerow(row)

These examples should give you a basic understanding of how to read and write CSV files in Python using the csv module. For more advanced usage and additional options, refer to the Python documentation on the csv module.




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