Python for beginners: Difference between revisions
From Algolit
| Line 1: | Line 1: | ||
| + | Next pages: [[Python_for_beginners/collections|Collections]] // [[Python_for_beginners/loops_and_conditions|Loops and Conditions]] // [[Python_for_beginners/anthology|Create anthology]] | ||
| − | + | '''=== VARIABLES ===''' | |
| − | |||
| − | |||
| − | === VARIABLES === | ||
* Introduction to the objects string & list with their different attributes | * Introduction to the objects string & list with their different attributes | ||
| − | * | + | * uses the shell |
| Line 16: | Line 14: | ||
| − | + | '''* Write text using STRING''' | |
>>> print("La Cambre") | >>> print("La Cambre") | ||
| − | * Exercise: Write your name''' | + | ** Exercise: Write your name''' |
| + | |||
| + | >>> ... | ||
| − | + | '''* Adding text''' | |
>>> print("Brussels"+"Paris") | >>> print("Brussels"+"Paris") | ||
| Line 29: | Line 29: | ||
>>> print("Brussels "+"Paris") | >>> print("Brussels "+"Paris") | ||
| − | * Exercise: Write your address''' | + | ** Exercise: Write your address''' |
| − | + | '''* Composing a sentence''' | |
>>> print("Paris", "to", "London", "via", "Brussels") | >>> print("Paris", "to", "London", "via", "Brussels") | ||
| Line 38: | Line 38: | ||
>>> print("Paris to London via Brussels") | >>> print("Paris to London via Brussels") | ||
| − | * Exercise: Write your favourite expression''' | + | ** Exercise: Write your favourite expression''' |
| − | + | '''* Multiply''' | |
>>> print(3*3) | >>> print(3*3) | ||
| Line 47: | Line 47: | ||
>>> 3 * "algolit" + " in Brussels" | >>> 3 * "algolit" + " in Brussels" | ||
| − | * Exercise: Write 'I write the alphabet' 3 times. | + | ** Exercise: Write 'I write the alphabet' 3 times. |
Note: there are always different possible solutions | Note: there are always different possible solutions | ||
| − | + | '''* 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 | ||
| Line 69: | Line 69: | ||
>>> print(sentence, letter) | >>> print(sentence, letter) | ||
| − | * Exercise: Print your letter, word, sentence | + | ** Exercise: Print your letter, word, sentence |
| − | + | '''* Add punctuation''' | |
>>> print(letter + " " + word + " " + sentence + ".") | >>> print(letter + " " + word + " " + sentence + ".") | ||
| Line 82: | Line 82: | ||
>>> print letter + "! " + word + "? " + sentence + "." | >>> print letter + "! " + word + "? " + sentence + "." | ||
| − | * Exercise: change content of one of variables, over and over, see how result changes | + | ** Exercise: change content of one of variables, over and over, see how result changes |
| − | + | '''* Calculate!''' | |
** the length of the string | ** the length of the string | ||
>>> print(len(letter)) | >>> print(len(letter)) | ||
| − | |||
>>> print(len(word)) | >>> print(len(word)) | ||
| − | + | >>> print(len(sentence)) | |
| − | >>> print(len(sentence)) | ||
| − | |||
>>> print(len(word))+2) | >>> print(len(word))+2) | ||
| Line 100: | Line 97: | ||
a_number = len(word)+2 | a_number = len(word)+2 | ||
| − | |||
print(a_number) | print(a_number) | ||
| − | |||
a_number += 3 | a_number += 3 | ||
| − | |||
print(a_number) | print(a_number) | ||
| − | * Exercise: Compose a sentence word by word, specifying each word as a variable. The length of the sentence is 20. | + | ** 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 | * variable | ||
| Line 118: | Line 112: | ||
* integers | * integers | ||
* print() | * print() | ||
| − | |||
Latest revision as of 15:04, 21 November 2020
Next pages: Collections // Loops and Conditions // Create anthology
=== VARIABLES ===
- Introduction to the objects string & list with their different attributes
- uses 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()