Dataset Preprocessing Code

Setting up the task

I’m approaching the task by reading the CSV file to check the initial dataset stats—columns, data types, missing values, and duplicates. This will guide data cleaning and normalization steps effectively.

Crafting the code

I’m constructing a Python snippet to read a CSV file, display columns, data types, and missing values, and describe the numerical details to help inform data cleaning strategies.

Thought about dataset preprocessing code for 5 seconds

Below is a basic Python script you can use to:

1. Load your CSV dataset.
2. Explore its high-level properties (dimensions, column names, dtypes).
3. Check for missing values.
4. Generate summary statistics.

This information will help us determine what cleaning and normalization steps we need in subsequent steps.

import pandas as pd

# Replace 'your_dataset.csv' with the path to your CSV file
csv_file_path = 'your_dataset.csv'

# 1. Load CSV
df = pd.read_csv(csv_file_path, low_memory=False)  # low_memory=False helps with large files

# 2. Basic dataset information
print("Dataset Dimensions (rows, columns):", df.shape)
print("\nColumn Names:\n", df.columns.tolist())

# 3. Data Types of Each Column
print("\nColumn Data Types:\n", df.dtypes)

# 4. Basic Info (including non-null counts)
print("\nDataFrame Info:")
df.info()

# 5. Statistics (numerical and non-numerical)
# 'include="all"' shows stats for both numeric and object type columns
print("\nDescriptive Statistics (including object columns):")
print(df.describe(include='all'))

# 6. Missing Values Check
missing_values = df.isnull().sum()
print("\nNumber of Missing Values per Column:\n", missing_values)

# 7. (Optional) Quick Look at First Few Rows
print("\nFirst 5 Rows of the Dataset:")
print(df.head())

# 8. (Optional) Quick Look at Last Few Rows
print("\nLast 5 Rows of the Dataset:")
print(df.tail())

# 9. (Optional) Count of Unique Values in Each Column
unique_counts = df.nunique()
print("\nNumber of Unique Values per Column:\n", unique_counts)

Instructions

1. Copy and paste the above script into a Python file (e.g., data_exploration.py) or a Jupyter notebook cell.
2. Update the variable csv_file_path to the location of your dataset.
3. Run the script.
4. Share the console output (or any relevant observations) from this script. The information about missing values, data types, etc. will help us decide on the data cleaning and normalization steps.

Once you provide the output (or a summary of it), I can write the next portion of the code for data cleaning (e.g., handling missing values, outliers, duplicates) and data normalization as needed.