This article follows on from the first three parts that can be viewed here:

• https://128mots.com/index.php/2019/12/04/python-les-bases-capes-nsi-snt-en-plus-de-128-mots/
• https://128mots.com/index.php/2019/12/06/python-les-bases-en-plus-de-128-mots-partie-2/
• https://128mots.com/index.php/2019/12/07/python-les-bases-en-plus-de-128-mots-partie-3/

I am discussing the basics of the Python language to learn it quickly. In France these bases are taught in high school at the second SNT, first and senior NSI classes. They are also part of the knowledge program for CAPES NSI.

Exceptions:

When an error occurs, (an exception) it can be managed using the try statement:

try:
  print (r)
Except NameError:
  print ("undefined r variable")
Except:
  print ("Other exception") 

Comments:

#Ceci is a comment
#sur
#plusieurs line
print ("Hello Python")
"""
This is a comment
On
several line
"""
print ("Hello Python")

Classes:

Classes are like an object builder, it helps to model real concepts.

Person class:
  def __init__ (self, name, age):
    self.name
    self.age

  def ma_fonction (self):
    print ("Name of person: " 'self.name)

p1 - Person ("Sebastian," 36)
print (p1.name)
print (p1.age) 
p1.ma_fonction()
p1.age - 40 #Modification of the properties of the object
del p1.age #supprime ownership of the object
del p1 #supprime the object

self is a reference to the current instance of the class and is used to access variables that belong to the class. It may be named other than self, but it must be the first setting of any class function.

Heritage:

Inheritance defines a class that inherits all the methods and properties of another class.

Animal class:
   def walk():
       print ('walk')

Class Dog (Animal)
    Pass

c1 - Dog ()
c1.walk()

Manufacturer:

The function __init () is automatically called every time a new object is created.

super () will make the child class inherit all the methods and properties of its parent.

Student class (Person):
  def __init__ (self, name, first name):
    super().__init__ (name, first name) 

This article follows on from the first two parts that can be viewed here:

• https://128mots.com/index.php/2019/12/04/python-les-bases-capes-nsi-snt-en-plus-de-128-mots/
• https://128mots.com/index.php/2019/12/06/python-les-bases-en-plus-de-128-mots-partie-2/

I am discussing the basics of the Python language to learn it quickly. In France these bases are taught in high school at the second SNT, first and senior NSI classes. They are also part of the knowledge program for CAPES NSI.

Tuples:

A tuple is an orderly collection like lists and immutable (that does not change).

exampleTuple ("apple," "pear," "strawberry")
print (exampleTuple)
print (exampleTupl[1]e)
print (exampleTu[-1]ple) #L negative indexing means from the end, -1 refers to the last element, -2 refers to the penultimate element, etc.
print (exampleTup[1:2]le) #Vous can specify an index range by specifying where to start and where to finish the range.
z - list (exampleTuple) #conversion tuple on the list
z[1] - "banana" 
x - tuple(z) #conversion tuple list

for x in exampleTuple: #Boucle on a tuple
  print (x) 

if "pear" in exampleTuple: #test of existence in a tuple
  print ("Yes") 

Unpacking:

coordinates - (1.2,3)
x,y,z - coordinates
print (x)

Dictionaries:

A dictionary is an unordered, editable and indexed collection.

Customer
   "name": "Elodie"
   "age": "45"
   "year": 1980
 }

print (custome["age"]r)
custo["nouvelleCle"]mer - "new value" #ajoute a new key and value
customer.get("solde") #renvoi 'None' because the key does not exist

Functions:

The features allow the code to be organized into reusable pieces. In Python, a function is defined using the keyword def.

def exemple_fonction():
  print ("TestFunction")

exemple_fonction()

The data can be switched to functions as a setting. You can add as many settings as you like, just separate them by a comma.

def exemple_fonction (first name):
  print ("Hello" - first name)

exemple_fonction ("John")
exemple_fonction ("Pierre")

This article follows the first part that can be found here: http://128mots.com/index.php/2019/12/04/python-les-bases-capes-nsi-snt-en-plus-de-128-mots/

As with the first article, I'm talking about the basics of the Python language to learn it quickly. In France these bases are taught in high school at the second SNT, first and senior NSI classes. They are also part of the knowledge program for CAPES NSI.

Operators' priority:

I summarize the priority of Python operators, from the highest priority to the lowest priority

• Parentheses (): Grouping of operations
• Exhibitor: x 'y'
• Multiplication, matrix multiplication, division, whole division, modulo: ' , ', /, //, %
• Addition, subtraction:

Mathematical functions:

import math

• math.ceil (2.6) upper whole
• math.floor(-5.3) whole part, gives here -8.0.
• math.sqrt: square root.
• math.pow (5, 5): 5 power 5.
• math.exp(2): exponential function.
• math.log(2): logarithm function
• math.log(3, 2): log in base 2.
• math.factorial(4): factor
• math.fsum(L): sum of the items on a list
• math.sin, math.cos, math.tan: trigonometric functions
• math.pi: pi
• math.degrees(y): converting radians to degrees
• math.radians(y): conversion of degrees into radians

Conditional expressions:

Python relies on indentation to define the scope of the code.

x - 100
Y - 23
if x y:
  print ("x bigger than y")
elif a b:
  print ("equality")
else
  print ("y larger than x")

F-strings:

import math
print (f'The value of pi is 'math.pi:.3f'.')

Two-dimensional lists (matrices):

matrix,[[1, 2, 3] [4,5, 6], [7, 8, 9]]
print (matri[0][1]x)

Methods on the lists:

list.append ('n') #Ajoute an item at the end of the list
list.insert (0,'a') #Ajoute an item at the specified position
list.pop(1) #Enleve the item from the list to the specified position