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Python for beginners: Difference between revisions

From Algolit
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Next pages: [[Python_for_beginners/loops_and_conditions|Loops and Conditions]] // [[Python_for_beginners/anthology|Create anthology]]
 
Next pages: [[Python_for_beginners/loops_and_conditions|Loops and Conditions]] // [[Python_for_beginners/anthology|Create anthology]]
  
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'''=== VARIABLES ==='''
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=== VARIABLES ===
  
 
* Introduction to the objects string & list with their different attributes
 
* Introduction to the objects string & list with their different attributes
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* uses the shell
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* use of the shell
  
  
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'''* Write text using STRING'''
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==== Write text using STRING ====
  
 
>>> print("La Cambre")  
 
>>> print("La Cambre")  
  
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** Exercise: Write your name'''
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* Exercise: Write your name'''
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>>> ...
 
  
  
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'''* Adding text'''
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==== Adding text ====
  
 
>>> print("Brussels"+"Paris")
 
>>> print("Brussels"+"Paris")
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>>> print("Brussels "+"Paris")  
 
>>> print("Brussels "+"Paris")  
  
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** Exercise: Write your address'''
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* Exercise: Write your address'''
  
  
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'''* Composing a sentence'''
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==== Composing a sentence ====
  
 
>>> print("Paris", "to", "London", "via", "Brussels")
 
>>> print("Paris", "to", "London", "via", "Brussels")
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>>> print("Paris to London via Brussels")
 
>>> print("Paris to London via Brussels")
  
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** Exercise: Write your favourite expression'''
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* Exercise: Write your favourite expression'''
  
  
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'''* Multiply'''
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==== Multiply ====
  
 
>>> print(3*3)
 
>>> print(3*3)
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>>> 3 * "algolit" + " in Brussels"  
 
>>> 3 * "algolit" + " in Brussels"  
  
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** Exercise: Write 'I write the alphabet' 3 times.
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* Exercise: Write 'I write the alphabet' 3 times.
  
 
Note: there are always different possible solutions  
 
Note: there are always different possible solutions  
  
  
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'''* Write a string as a variable'''
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==== Write a string as a variable ====
  
 
** Avoids having to retype your string each time you use it
 
** Avoids having to retype your string each time you use it
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>>> print(sentence, letter)
 
>>> print(sentence, letter)
  
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** Exercise: Print your letter, word, sentence
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* Exercise: Print your letter, word, sentence
  
  
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'''* Add punctuation'''
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==== Add punctuation ====
  
 
>>> print(letter + " " + word + " " + sentence + ".")  
 
>>> print(letter + " " + word + " " + sentence + ".")  
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>>> print letter + "! " + word + "? " + sentence + "."  
 
>>> print letter + "! " + word + "? " + sentence + "."  
  
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** Exercise: change content of one of variables, over and over, see how result changes
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* Exercise: change content of one of variables, over and over, see how result changes
  
  
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'''* Calculate!'''
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==== Calculate! ====
  
 
** the length of the string
 
** the length of the string
  
 
>>> print(len(letter))
 
>>> print(len(letter))
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>>> print(len(word))
 
>>> print(len(word))
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>>> print(len(sentence))  
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 +
>>> print(len(sentence))
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>>> print(len(word))+2)
 
>>> print(len(word))+2)
  
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a_number = len(word)+2
 
a_number = len(word)+2
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print(a_number)
 
print(a_number)
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a_number += 3
 
a_number += 3
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print(a_number)
 
print(a_number)
  
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** Exercise: Compose a sentence word by word, specifying each word as a variable. The length of the sentence is 20.
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* Exercise: Compose a sentence word by word, specifying each word as a variable. The length of the sentence is 20.
  
  
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'''What you've learned'''
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==== What you've learned ====
 
    
 
    
 
* variable
 
* variable
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* integers
 
* integers
 
* print()
 
* print()
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* len()

Revision as of 14:41, 21 November 2020

Next pages: Loops and Conditions // Create anthology


VARIABLES

  • Introduction to the objects string & list with their different attributes
  • use of the shell


# USING STRINGS

A string is a chain of characters / text and can contain any type of characters

A string is defined by " "


Write text using STRING

>>> print("La Cambre")

  • Exercise: Write your name


Adding text

>>> print("Brussels"+"Paris")

>>> print("Brussels "+"Paris")

  • Exercise: Write your address


Composing a sentence

>>> print("Paris", "to", "London", "via", "Brussels")

>>> print("Paris to London via Brussels")

  • Exercise: Write your favourite expression


Multiply

>>> print(3*3)

>>> 3 * "algolit" + " in Brussels"

  • Exercise: Write 'I write the alphabet' 3 times.

Note: there are always different possible solutions


Write a string as a variable

    • Avoids having to retype your string each time you use it
    • You can change values at any time of the writing process

>>> letter = "a"

>>> print(letter)

>>> word = "algolit"

>>> print(word)

>>> sentence = "I learn to read and write again in Python."

>>> print(sentence, letter)

  • Exercise: Print your letter, word, sentence


Add punctuation

>>> print(letter + " " + word + " " + sentence + ".")

>>> print(letter + "! " + word + "? " + sentence + ".")

>>> letter = "i"

>>> print letter + "! " + word + "? " + sentence + "."

  • Exercise: change content of one of variables, over and over, see how result changes


Calculate!

    • the length of the string

>>> print(len(letter))

>>> print(len(word))

>>> print(len(sentence))

>>> print(len(word))+2)

    • and more

a_number = len(word)+2

print(a_number)

a_number += 3

print(a_number)

  • Exercise: Compose a sentence word by word, specifying each word as a variable. The length of the sentence is 20.


What you've learned

  • variable
  • value
  • assignment operator (=)
  • difference between variables and values
  • integers
  • print()
  • len()
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