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![Load Numbers Remove the last character of newline(“n”) def load_numbers(numbers, filename): in_file = open(filename, "rt") “The stringn” while True: in_line = in_file.readline() if not in_line: break in_line = in_line[:-1] “The string” in_file.close() File I/O Introduction](https://image.slidesharecdn.com/fileio-101213100021-phpapp01/75/Python-FileIO-10-2048.jpg)
![Load Numbers def load_numbers(numbers, filename): in_file = open(filename, "r") while True: in_line = in_file.readline() if not in_line: break in_line = in_line[:-1] name, number = in_line.split(‘,’) # split to two parts numbers[name] = number # save them to numbers in_file.close() File I/O Introduction](https://image.slidesharecdn.com/fileio-101213100021-phpapp01/75/Python-FileIO-11-2048.jpg)
![Save Numbers def save_numbers(numbers, filename): out_file = open(filename, "w") for k, v in numbers.items(): out_file.write(k + "," + v + "n") out_file.close() Multiple assignment: (k, v) = [“name”, “phone”] >>> k “name” >>> v “phone” File I/O Introduction](https://image.slidesharecdn.com/fileio-101213100021-phpapp01/75/Python-FileIO-12-2048.jpg)
Uploaded byColin Su
Python-FileIO
This document discusses Python file input/output (I/O) operations. It introduces functions for loading and saving number data from/to files. The load_numbers function opens a file, reads each line by splitting on commas into a name and number, and saves these to a dictionary. The save_numbers function opens a file and writes each dictionary key-value pair on its own line with comma separation. Completing these functions involves properly opening, reading, and closing files while parsing the data format.
Python-FileIO
- 1. File I/O Python Built-inData Type NCCU Computer Science Dept. Python Programming for Non-Programmer
- 2. Recall & WarnUp name = open(‘filename’, ‘w’) read() readline() readlines() write() writelines() File I/O Introduction
- 3. Get The Source •goo.gl/18AIo • Finish the code by yourself! File I/O Introduction
- 4. Declaration def load_numbers(numbers, filename): pass def save_numbers(numbers, filename): pass File I/O Introduction
- 5. Declaration def load_numbers(numbers, filename): pass def save_numbers(numbers, filename): pass Fill them! File I/O Introduction
- 6. Two New Functions •Load Numbers Variable File • Save Numbers Variable File File I/O Introduction
- 7. File Format Should bejust like below.... The President of Taiwan, 0912345678 Google Incorporate, 02-12345678 The President of NCCU, 02-29393091 The Queen of NCCU dogs, xxxxxx ..... File I/O Introduction
- 8. Load Numbers First, declarethe file object and the close method of the file def load_numbers(numbers, filename): in_file = open(filename, "rt") # do something... in_file.close() File I/O Introduction
- 9. Load Numbers And makea while loop for reading lines of file def load_numbers(numbers, filename): in_file = open(filename, "rt") while True: in_line = in_file.readline() if not in_line: break in_file.close() File I/O Introduction
- 10. Load Numbers Remove the last character of newline(“n”) def load_numbers(numbers, filename): in_file = open(filename, "rt") “The stringn” while True: in_line = in_file.readline() if not in_line: break in_line = in_line[:-1] “The string” in_file.close() File I/O Introduction
- 11. Load Numbers def load_numbers(numbers,filename): in_file = open(filename, "r") while True: in_line = in_file.readline() if not in_line: break in_line = in_line[:-1] name, number = in_line.split(‘,’) # split to two parts numbers[name] = number # save them to numbers in_file.close() File I/O Introduction
- 12. Save Numbers def save_numbers(numbers, filename): out_file = open(filename, "w") for k, v in numbers.items(): out_file.write(k + "," + v + "n") out_file.close() Multiple assignment: (k, v) = [“name”, “phone”] >>> k “name” >>> v “phone” File I/O Introduction
- 13. Finish • Finish Code:goo.gl/DDK7d • Practice by yourself File I/O Introduction