The-Practice-of-Computing-Using-Python-Solved

In this repository I will solve The Practice of Computing Using Python book the third edition by William F. Punch Global Edition by Pearson.
Link of the book on Amazon.

Chapter 1

The exercises in this chapter focused on Variables, Math, Date, and Times

The Used Methods for each Module:

1. datetime Module

from datetime import datetime
  
datetime(yy,mm,dd) # to make these numbers in a Time Formula

for expanded explanation you can watch this video or you can read the dictionary

2. realtivedelta Module

from dateutil import relativedelta
  
diff = relativedelta.relativedelta(date1,date2)
years = diff.year
months = diff.month
days = diff.days
# Basically it helps us to know the year, month, day for a specific amount of time

3. calendar Module

import calendar 
 
calendar.month(yy,mm)
#To give you the days for that month

for expanded explanation you can watch this video or you can read the dictionary

4. date Module

from datetime import date

day = date.today() # The date for this day

---

Chapter 2

The exercises in this chapter focused on Control using [if statement] , and Loops using [for, and while loop]

The Used Methods for each Module:

1. Random Module

import random

choices = ['a','b','c']
choice = random.choice(choices)
# this command chose a random element from a list, in this case it could be (a or b or c)

---

Chapter 3

This Chapter talked about algorithms and how algorithm should be:

• Detailed
• Effictive
• Specefic
• General Purpose

And the Program should be:

• Readable
• Robust
• Correct

---

Chapter 4

This Chapter focused on Strings and how you can solve problems by manipulating the string. We used a lot of strings methods in this chapter, and here are the summary for them.

Strings Methods:

string = " Hi, I am using Python "
char = 'B'

string.capitalize() # Hi, i am using python
string.upper() # HI, I AM USING PYTHON
string.lower() # hi, i am using python
string.replace('i','c') # Hc, I am uscng Python
string.lstrip() #Hi, I am using Python
string.rstrip() # Hi, I am using Python
string.strip() #Hi, I am using Python
string.count('am') #1
string.index('u') #10
string.find('o') #20 
string.split() #['Hi,', 'I', 'am', 'using', 'Python']
string.swapcase() # hI, i AM USING pYTHON

char.islower() #False
char.isupper() #True
char.swapcase() #b
char.isspace() #False
char.isalnum() #True
char.isdigit() #False
char.isalpha() #True

The Used Methods for each Module:

1. Counter Module: This module is very helpful for counting and showing the result as a dictiontry. For Example:

from collections import Counter

string = "Counter module will count anything you want, words for example or character or symbols .... Anything."
print(Counter(string))
"""
The Output:
Counter({' ': 15, 'o': 9, 'n': 7, 'r': 7, 't': 6, 'e': 5,
         'l': 5, 'a': 5, '.': 5, 'u': 4, 'y': 4, 'm': 3, 
         'w': 3, 'i': 3, 'c': 3, 'h': 3, 's': 3, 'd': 2, 
         'g': 2, 'C': 1, ',': 1, 'f': 1, 'x': 1, 'p': 1, 
         'b': 1, 'A': 1})
"""

#if we wanted to count words:
string = string.split()
print(Counter(string))
"""
The Output:
Counter({'or': 2, 'Counter': 1, 'module': 1, 'will': 1, 'count': 1, 'anything': 1,
         'you': 1, 'want,': 1, 'words': 1, 'for': 1, 'example': 1, 'character': 1, 
         'symbols': 1, '....': 1, 'Anything.': 1})
"""

2. PrettyTable Module: This Module is used for making nice clear tables:

from prettytable import PrettyTable
table = PrettyTable() # To make an empty table
table.field_names = [] # To add Columns names as a "LIST"
table.add_row([]) # To add rows as a "LIST"
print(table)

3. string Module: Simple method made ready variable which make things easier. Some of them:

import string

punc = string.punctuation
lett = string.printable
asc = string.ascii_letters
ascLow = string.ascii_lowercase
ascUpp = string.ascii_uppercase
space = string.whitespace
dig = string.digits

---

Chapter 5

This Chapter talked about functions, and the first reason for using or building functions is reusability and it make your code cleaner. every function should do only one thing.

Types of Functions in Python

Type of Functions	Built in Functions	User-Defined Functions (UDFs)
Example	print(max(lst))	avg = lambda lst: sum(lst) / len(lst)

User-Defined Functions (UDFs) devided into two types:

1. Return Functions:

functinos have return statement and return a value. Also you can define a variable with and its value is the return of the function.

For Example

def avg(lst):
     return sum(lst)/len(lst)

lst = [1,2,3,4,5,6,7,8,9,10]
average_list = avg(lst)

print(average_list)
"""The output:
   5.5
"""

2. Procedure Functions:

funtions don't return a thing, it's just make a procedure for the input maybe like adding 5 to a number or anything like that, but doesn't have a return statement. And you can't define a variable with value of it. Well.... you can, but it will be a none value

For Example

def print_elements(lst):
     for i in lst:
          print(lst, end = " ")
          
lst = [1,2,3,4,5,6,7,8,9,10]
elements= print_elements(lst)

print(elements)
"""The Output:
   1 2 3 4 5 6 7 8 9 10 None
"""

The None shown because the print_elements functions doesn't return any value, it's just printing elements without returning any value.

Scope

This Chapter also talked about the Scope. It's important to understand this concept or you will have errors in your code without knowing how to debugging it.
For Example: If you defined a variable inside a function you can't use it outside the function.

For Example:

def avg(lst):
     sum_of_the_list = sum(lst)
     average = sum_of_the_list / len(lst)
     return average

if you tried to print the sum_of_the_list you will get an error : name "sum_of_the_list" is not defined.
So be aware to that, if you defined a variable inside a function you can't use outside the function.

---

Chapter 6

This Chapter talked about files and how to work with them.

File modes:

Mode	How opened	File Exists	File Does Not Exitst
'r'	read-only	Opens that file	Error
'w'	write-only	Clears the file contents	Creates and opens a new file
'a'	write-only	File content left intact and new data appended at file's end	Creates and opens a new file
'r+'	read and write	Reads and overwrites from the file's beginning	Error
'w+'	read and write	Clears the file contents	Creates and opens a new file
'a+'	read and write	File content left intact and read and write at file's end	Creates and opens a new file

Chapter 7

This Chapters focused on lists and tuples and the difference between of them.

Chapter 8

In this Chapter we've just implement on functions in advanced way.