Let me share with you my daily experience of learning python (detailed explanation)

After reading the relevant information about python, the biggest feature is that it is simple and easy to use. After learning it, I feel that it is true. Now let me talk about my feeling after learning it.

1. Double quotes and single quotes in python have the same effect, print 'hello World' and print "hello World" are the same (used in the print statement to connect strings,)

2 .Python, when using variables, does not need to define a type, just assign an initial value, it is somewhat similar to defining variables in JavaScript, but it is simpler, and you don’t even need var

3.Python syntax is very simple, and there is no need for at the end of each line; statement blocks are completely distinguished by levels. That is to say, if the places where the indentation should be consistent are not aligned, the program will report an error, which ensures from another angle It improves the standardization of program writing

4.Control statements in python, if, while, for.It is worth noting that the conditions do not have parentheses, and you must add: after the condition, while can also be There is an else statement

if a == 3 :
                      print 'it is 3'
               elif a == 5 :
                                     print 'it is bigger than 3'
               else :
                      print 'it  is smaller than 3'

5.pObject of the ython class, is an instance of the class in java. If there is a class Person, use p=Person([ 'Parameter'....]), that is, you can call the method in Person.

It is worth noting that the first parameter of the class method in python must be self (equivalent to this in java) , python does not have a constructor method. After creating a class, the __init__() method of the class will be automatically called. This method can be equivalent to the constructor method of java to complete some initialization operations.

6.python Process-oriented and object-oriented

7.How to define functions in python

    def fun_name(parameter1,parameter2...):
                         pass#函数体

8.Python, the concept of modules,that is When a program is made public, it is also an ordinary Python file. In other programs to be called, it is OK to import the module name, and then use the module name. The method can use its method, or you can import the method name from the module name, and then Just call the method directly

9.python, how to write exceptions

  try:
               语句体
          except(Exception名称,可以是自定义的exception):
                ..........
          finally:
                .........

10.Data structures in python include lists, tuples, and dictionaries.The definition is as follows

mylist = ['apple','banana','orange']列表
               zoo = ('aaa','bbb','ccc')元组
               dic = {'zhang':'san',
                         'li':'si','wang':'wu'}

Thank you everyone for reading, I hope you will benefit a lot.

This article is reproduced from: https://blog.csdn.net/BeWhatYouAre/article/details/7295427

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