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CSV File Operations for Data Science

Learn how to create, write, and read CSV files in computer programming. Explore examples and tasks related to CSV file handling for data science purposes.

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CSV File Operations for Data Science

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  1. INC 161 , CPE 100Computer Programming Lab 9

  2. www.kaggle.com

  3. Open your notepad (or other text editor). • Write the following and save. • 3,2,5 • 1,7,13 • Rename the extension to .csv • Open with excel. • Open with notepad.

  4. Comma-Separated Values (CSV) A text file that has its values as numbers or strings, separated by commas and new lines. Note: This is not excel workbook format.

  5. Example 1 (Write file) w = write #include <stdio.h> main() { FILE *fp; fp = fopen(“file.txt”, “w”); fprintf(fp,“Hello”); fclose(fp); } • File handle • Open file • Write • Close file

  6. Example 1 (Write file) #include <stdio.h> main() { FILE *fp; fp = fopen(“file.csv”, “w”); fprintf(fp,“3,2,5\n”); fprintf(fp,“1,7,13\n”); fclose(fp); } • File handle • Open file • Write • Close file

  7. Example 2 (Read file) #include <stdio.h> main() { int a,b,c; FILE *fp; fp = fopen(“file.csv”, “r”); fscanf(fp,“%d,%d,%d”,&a,&b,&c); fscanf(fp,“%d,%d,%d”,&a,&b,&c); fclose(fp); }

  8. Example 3 (Read file) #include <stdio.h> main() { int a,b,c,d; FILE *fp; fp = fopen(“file.csv”, “r”); d = fscanf(fp,“%d,%d,%d”,&a,&b,&c); d = fscanf(fp,“%d,%d,%d”,&a,&b,&c); d = fscanf(fp,“%d,%d,%d”,&a,&b,&c); fclose(fp); } Check out the return from scanf

  9. Data Science Investigate the Pokemon database.

  10. Task 1 Print all the pokemon’s name on the screen. Read header once. Use loop for each subsequence lines. Instead of using %s for string Use %[^\n,]

  11. Task 2 Write a program to print the pokemon’s name that has the highest HP. (for Student ID 01-10) Attack (for Student ID 11-20) Defense (for Student ID 21-30) Total (for Student ID 31-) Hint: Use find minimum in lecture 6 (array)

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