Python: Python basic


Khóa học qua video:
Lập trình Python All Lập trình C# All SQL Server All Lập trình C All Java PHP HTML5-CSS3-JavaScript
Đăng ký Hội viên
Tất cả các video dành cho hội viên

print()

print() function uses to print to the output (screen) information or value of variable

Example:

print("Hello Python")

Practical:

Using print() function to print some information about you: name, age, school/university, hobies, unlike.

Input a string:

To input a string you can use input() function.

Example:

input("Please input your name: ")

If you want to save input information you can do as following:

name = input("Please input your name: ")

where:

name: name of variable. The name is optional, that you can set your own.

= : asignment or store. You use this operator to store the input information to the variable.

Practical:

Input some information about you: name, age, school, hobies, unlike.

Mathematics operators:

We have mathematics operators as following: + (addition), - (subtraction), * (multiple), / (float division), // (integer division), % (module division), ** (exponetial)

Example:

a = 9

b = 5

print(a + b)

print(a - b)

print(a * b)

print(a / b)

print(a // b)

print(a % b)

print(a ** 2)

Practial:

Separating a number to number letters. For example, number 153 can separate to 1, 5, 3.

Coparison operators:

We have comparison operators as following: > (greater than), >= (greater than or equal), < (less than), <= (less than or equal), == (equal), != (different)

Example:

a = 9

b = 5

print(a > b)

print(a >= b)

print(a < b)

print(a <= b)

print(a == b)

print(a != b)

Logical operators:

We have logical operators as following: and, or, not.

Where:

and: Requires two both conditions at left and right of it must be True than it returns True, otherwise it returns False.

or: Requires either left condition or right condition must be True than it returns True, otherwise it returns False.

Example:

a = 9

b = 5

print(0 <= a and a <= 10) # It will print: True

a = 19

print(0 <= a and a <= 10) # It will print: False

print(0 <= a or a <= 10) # It will print: True

print(not(0 <= a or a <= 10)) # It will print: False

if-else condition:

To understanding about if-else condition, we see a following example:

avgMark = float(input("Input an average mark: "))

What is academic ability?

if avgMark >= 9 and avgMark <= 10:

  print("Excellent")

elif avgMark >= 8 and avgMark < 9:

  print("Good")

elif avgMark >= 6.5 and avgMark < 8:

  print("Pretty")

elif avgMark >= 5 and avgMark < 6.5:

  print("Average")

elif avgMark >= 0 and avgMark < 5:

  print("Retake the exam")

else:

  print("This average mark is invalid!")

for loop:

for loop can be understood through some following examples:

example 1: Print numbers from 0 to 9:

for i in range(10):

  print(i)

example 2: Print numbers from 1 to 10:

for i in range(1, 11):

  print(i)

example 3: Print numbers from 1 to 10 with step = 3:

for i in range(1, 11, 3):

  print(i)

example 4: Print numbers from 10 down to 1:

for i in range(10, 0, -1):

  print(i)

example 5: Print numbers from 10 down to 1 with step = 3:

for i in range(10, 0, -3):

  print(i)

while loop:

The while loop use to loop statements that infinite.

Example: Input a float number that greater than or equal 0 and less than 100.

number = float(input("Input a number: "))

while not(0 <= number and number < 100):

  number = float(input("Re-input a number: "))

Function:

A function uses to execute a specific task.

The function makes a program to become clear, easy to read, maintain, update.

We can use a function many times, many where in a program.

To define a function, we use a syntax as follows:

 

« Trước: Một kỹ thuật chuẩn đoán bệnh viêm da cơ địa sử dụng mạng học sâu
Khóa học qua video:
Lập trình Python All Lập trình C# All SQL Server All Lập trình C All Java PHP HTML5-CSS3-JavaScript
Đăng ký Hội viên
Tất cả các video dành cho hội viên
Copied !!!