Python Beginner - Module 5 - Dave & Alison 01

 Terus berlanjut, kita sampai ke Module 5 dari Alison Course dan pelajaran ke 7 (video ke 7/24) dari Dave Gray.

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Module 5, Chapter 1: Modules, Packages, Strings, and Exceptions | Module & Package | Alison

Module & Package

Module:

- a module is a file containing Python code. It can define functions, classes, and variables, and may also include runnable code. 

- If you want to create a module, simply create a .py file with your desired code and import it into your program using the import statement.

Module for string

# A module for string operations

def reverseString(string):

    return string[::-1]

Import string

import strings

print(strings.reverseString('hello'))

Run Python File:

olleh

Which of these is used to call a module from another file into your program? Choose one.

- using the import function

---------------------------------------------

Module 5, Chapter 2: Modules, Packages, Strings, & Exceptions | The Guessing Game | Alison

Guessing Game

import random

score = 10

randomNumber = random.randint(1,10)

while True:

    userNumberInput = int(input('Guess : '))

    if userNumberInput == randomNumber:

        print("congratulations your guessed right! your score is " + str(score))

        break

    else:

        print('better luck next time')

        score -= 1

Run Python File:

Guess : 1

better luck next time

Guess : 2

better luck next time

Guess : 3

congratulations your guessed right! your score is 8

What keyword is used to close operations in Python exceptions? Choose one.

- Finally keyword

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Module 5, Chapter 3: Module, Packages, Strings, and Exceptions | Exceptions/Errors | Alison

Exceptions/Error

3 errors in Python:

1-Logic

2-Run Time

3-Compiling

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Module 5, Chapter 4: Modules, Packages, Strings, and Exceptions | Errors Practice | Alison

Errors Practices

Coding dengan hasil benar

a = int(input('one : '))

b = int(input('two : '))

print(a + b)

Run Python File:

one : 1 two : 8 9

Sekarang, hasilnya salah, error

a = int(input('one : '))

b = int(input('two : '))

print(a + b)

Run Python File:

one : 1 two : b ...> error

ValueError: invalid literal for int() with base 10: 'b'

Error Correction

try:

    a = int(input('one : '))

    b = int(input('one : '))

    print(a + b)

except ValueError:

    print('Invalid Input')

Run Python File:

one : 1 one : b Invalid Input

True or False: ZeroDivisionError is a type of error in Python.

- True

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Module 5, Chapter 5: Modules, Packages, Strings, & Exceptions | String Operations | Alison

String Operations

>>> string = 'string'

>>> string.islower()

True

>>> string = 'STRING'

>>> string.islower()

False

>>> string = 'STRING'

>>> string.isupper() 

True

>>> string = '29'

>>> string.isdigit()

True

>>> string = '29'

>>> string.isdigit()

True

>>> string.replace('2', 'Hello')  

'Hello9'

a = 'ABC123DEF456'

def answer(string):

    alphabets = ''

    result = 0

    for char in string:

        if char.isdigit():

            result += int(char)

        else:

            alphabets += char

    return (alphabets, result)

print(answer(a))

Run Python File:

('ABCDEF', 21)

Which of these are examples of string operations in Python? Choose three.

- 'e' in string

- string.isdigit()

- string.swapcase()

The followings are the key points from this module:

A module is a single file consisting of Python code that can be imported into your program.

WHILE:

A package is basically a directory with Python files (i.e modules) and also can be imported into your program as well. 

The Import function is used to import modules from another file into your code. 

The following are the types of exceptions/errors mentioned:

• Compiling errors -- These are errors thrown when a program is being compiled or interpreted. e.g Extra space, function misspelling, missing colon or parentheses, etc. 
• Logical errors -- These are errors in your logic. e.g Calculating and getting a wrong answer. 
• Run-time errors -- This happens when something is done incorrectly on the part of the user. e.g User entering a string value when the application can only receive integers. 

Some possible errors that you can come across in Python include

• ValueError
• ZeroDivisionError
• TypeError. etc.

The following are string operations that one can run on string values in Python:

• string.islower -- To check if a string in lower case. 
• string.isupper -- To check if a string in upper case. 
• string.isdigit -- To check availability of digits in strings. 
• string.lower -- To change a string from upper to lower case. 
• string.upper -- To change a string from lower to upper case. 
• string.swapcase -- To swap the cases of the strings. 
• 'e' in string -- Searches for the character "e" in strings. 

Having completed this module, you will be able to: 

• Discuss file handling and how to write to different types of files. 
• Explain the basis of classes and subclasses. 
• Identify the different types of variables and methods. 
• Explain the concept of polymorphism. 

Lanjutkan ke Module 6:

File Handling: Files and the Object Oriented Approach | File Handling | Alison

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Dave Gray

7/24: Dictionaries and Set: Python Dictionaries and Sets for Beginners | Python tutorial - YouTube

Free: freeCodeCamp.org - YouTube

Kita akan belajar dictionaries dan set.

Dictionaries

band = {

    "vocals": "Plant",

    "guitar": "Page"

}

band2 = dict(vocals="Plant", guitar="Page")

print(band)

print(band2)

Run Python File:

{'vocals': 'Plant', 'guitar': 

'Page'}

{'vocals': 'Plant', 'guitar': 

'Page'}

Print(type(band))

Run Python File:

<class 'dict'>

Sets

# sets

nums = {1, 2, 3, 4}

nums2 = set((1,2,3,4))

print(nums)

print(nums2)

print(type(nums))

print(len(nums))

Run Python File:

{1, 2, 3, 4}        

{1, 2, 3, 4}        

<class 'set'>  ...Type data kita adalah 'set'     

4 ....> ada 4 elemen di data kita (1, 2, 3, 4)

Add element to set

nums = {1, 2, 3, 4}

nums2 = set((1,2,3,4))

print(nums)

print(nums2)

print(type(nums))

print(len(nums))

# add element to set

nums.add(5)

print(nums)

Run Python File:

{1, 2, 3, 4, 5} 

-------------------------------------------------------

Dave Gray (8/24): Python While Loops & For Loops | Python tutorial for Beginners - YouTube

Loops:

1) while

2) for 

while, value += 1

value = 1

while value < 10:

    print(value)

    value += 1

Run Python File:

1

2

3

4

5

6

7

8

9

If value == 5, then break

value = 1

while value < 10:

    print(value)

    if value == 5:

        break

    value += 1

Run Python File:

1

2

3

4

5

we change position, and use continue and else

value = 1

while value <= 10:

    value += 1

    if value == 5:

        continue

    print(value)

else:

    print("value is now equal to " + str(value))

Run Python File:

2

3

4

6

7

8

9

10

11

value is now equal to 11

for loop

names = ["Dave","Sara","John"]

for x in names:

    print(x)

Run Python File:

Dave

Sara

Johnx

for x in "Florida"

for x in "Florida":

    print(x)

Run Python File:

F

l

o

r

i

d

a

break 

names = ["Dave","Sara","John"]

for x in names:

    if x == "Sara":

        break

    print(x)

Run Python File:

Dave

Continue

names = ["Dave","Sara","John"]

for x in names:

    if x == "Sara":

        continue

    print(x)

Run Python File:

Dave

John

Untuk game (rps.py) bisa dilihat di video 5: Python User Input & Control Flow | Python tutorial - YouTube

Pelajaran selanjutnya (9/24), Python Function: Python Functions for Beginners | Python tutorial - YouTube

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