# NumPy I/O Operations: Exercises, Practice, and Solutions

## NumPy I/O Operations Exercises [ 20 exercises with solution]

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**1.** Write a NumPy program that reads data from a CSV file into a NumPy array. The CSV file contains numeric data.

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**2.** Write a NumPy array with both numeric and string data to a CSV file.

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**3.** Write a NumPy program that reads data from a CSV file into a structured NumPy array with specified data types for each column.

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**4.** Write a structured NumPy array to a CSV file, ensuring proper formatting of different data types.

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**5.** Write a NumPy program that reads a CSV file containing missing values into a NumPy array, handling the missing values appropriately.

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**6.** Write a NumPy program that saves a NumPy array to a text file with space as the delimiter and then reads it back into a NumPy array.

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**7.** Write a NumPy array to a binary file using np.save and then load it back using np.load.

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**8.** Write a NumPy program that saves multiple NumPy arrays to a single binary file using np.savez and then loads them back using np.load.

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**9.** Write a NumPy array to an HDF5 file and then read it back into a NumPy array.

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**10.** Write a NumPy program that reads a specific dataset from an HDF5 file into a NumPy array.

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**11.** Write a NumPy program that saves a large NumPy array to a compressed .npz file and then reads it back into a NumPy array.

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**12.** Write a NumPy array to an Excel file using a library like pandas and then read it back into a NumPy array.

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**13.** Write a NumPy program that reads data from a JSON file into a NumPy array. The JSON file contains numeric data.

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**14.** Write a NumPy array with numeric data to a JSON file.

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**15.** Write a NumPy program that reads data from a CSV file into a Pandas DataFrame and then converts it to a NumPy array.

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**16.** Write a NumPy array to a SQLite database and then read it back into a NumPy array.

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**17.** Write a NumPy program that saves a NumPy array to a MATLAB .mat file using scipy.io.savemat and then reads it back using scipy.io.loadmat.

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**18.** Write a NumPy program that read image data from a PNG file into a NumPy array using an image processing library like PIL or opencv.

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**19.** Write a NumPy program that saves a NumPy array as an image file (e.g., PNG) using an image processing library like PIL or opencv.

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**20.** Write a NumPy program to append a NumPy array to a Python list and print the result.

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