Python Learning Note-day1

Again code, record Python knowledge points, about Python variables, conditional judgment, loop statements

I. Classification of programming languages

1. Compiled language

After writing the code, compile the code into a binary file and run the compiled binaries when running. Like c/c++,c# and so on.

The feature is: run faster than fast, compile at once, run everywhere.

The disadvantage is that the compilation process is slow.

2. Explanatory language

Run a line of code to compile a line and when to run the code, such as: Php,python,ruby,java,go JavaScript, and so on. The Java language is also an explanatory language, and the. java file is compiled into a. class file, which is then executed by the JVM.

Disadvantage: Slow Running

3. Scripting language

A single language, called a scripting language. such as: Shell, bat, javascript,html,vb and so on.

Second, Python variables

1. Variable declaration

Python variables do not need to be declared in advance and are used directly, such as:

name = ' MyName '

Print (name)

You can assign a value that is declared.

2. Use of Python ', ', ', ' ', ' "'"

III. basic data types for Python

Iv. Conditions of Judgment

1, the conditional judgment statement is relatively simple, the following several:

If condition true:

EXECUTE Statement 1

Else

EXECUTE Statement 2

Example:

2, If-elif-else type

Extension: operator

> (greater than), < (less than), >= (greater than or equal), <= (less than equals),! = (not equal to), = = (equals)

If-elif-else Example:

V. Circulation

The loop repeats to do a thing. The Python loop has a for and while.

1. While loop

2. While-else Cycle

3. For loop

Six, string formatting

The code above is written using python3.6.4, Pycharm IDE, and executes successfully.

Python Learning Note-day1