Functions and Classes: Reading and Writing Files, Exceptions, and Storing Data in Python, Schemes and Mind Maps of Programming Paradigms

Download Functions and Classes: Reading and Writing Files, Exceptions, and Storing Data in Python and more Schemes and Mind Maps Programming Paradigms in PDF only on Docsity! Lecturer: Nguyen Tuan Long, Phd Email: ntlong@neu.edu.vn Mobile: 0982 746 235 Chapter 2: Functions and classes • Reading from a File • Writing to a File • Exception • Storing Data Chapter 2: Functions and classes 2 2.3. File and Execptions Reading from a File Reading Line by Line 1 filename = 'pi_digits.txt' 2 with open(filename) as file_object: 3 print(type(file_object) ) <class '_io.TextIOWrapper' > 1 filename = 'pi_digits.txt' 1 filename = ‘pi_digits.txt' 2 with open(filename) as file object: 2 with open(filename) as file_object: 3 for line in file_object: 3 for line in file object: 4 4 print(line) print(line.rstrip()) 3.1415926535 3.1415926535 8979323846 8979323846 2643383279 2643383279 Reading from a File Making a List of Lines from a File Working with a File’s Contents Reading from a File Large Files: One Million Digits Is Your Birthday Contained in Pi? Writing to a File Appending to a File 1 filename = 'programming.txt' 2 3 with open(filename,'a') as file_object: 4 file _object.write("I also love finding meaning in large datasets.\n") 5 file_object.write("I love creating apps that can run in a browser.\n") I love programming. I love creating new games. 3 I also love finding meaning in large datasets. I love creating apps that can run in a browser. ui pb Practice 10-3,…,10-5 Handling the ZeroDivisionError Exception 1 print(5/@) ZeroDivisionError Traceba ck (most recent call last) <ipython-input -28-fad876a50e27> in <module> ----> 1 print(5/@) ZeroDivisionError};, division by zero Using try-except Blocks try: print(5/@) except |ZeroDivisionError print("You can't divide by zero!") BWNPR You can't divide by zero! Counting… Count the frequency of each word in filenames = ['alice.txt', 'siddhartha.txt', 'moby_dick.txt', 'little_women.txt'] Practice 10-6,…, 10-10 Storing Data Using json.dump() and json.load() The JSON (JavaScript Object Notation)