Basic python programming exercises

1、 Random generation 5~15 Integer between , And find the sum of these two numbers 、 Bad 、 product 、 merchant 、 Idempotent operation

An important function of randomness is random, know random.randint(a,b) #,a,b Refers to the interval , This problem is solved .

2、 Enter a four digit integer , Output its reverse order number

This problem has two main points , One is four + Integers , The second is in reverse order

In reverse order, if you follow the common idea ： One number, one number, and then sort , Because numbers can't be sliced , If we first convert a number into a string （str, A string can be a sequence , Can index 、 Slicing, etc. ）, Reverse sort string and convert to integer type （int), It's a lot easier , Here are two ways to write ：

3、 Randomly generate one 100 A list of integers , Out of order , Then find its maximum value 、 minimum value 、 and 、 Average

This question has three points ：

One is to randomly generate a list ： To introduce random, Here you need to pay attention to the concept of lists []

The second is to disrupt the order ：shuffle（ Disrupt the sequence locally ）

Third, calculation ： Need to introduce numpy,python Basic computing functions in

4、 Generate a 8 Bit random password , The requirement must contain uppercase 、 Lowercase and numbers

The difficulty of this problem is how to make sure that there is a capital letter 、 A lowercase letter 、 And number , We need to introduce string function

5、 From the text （speech.txt） Read text from , And count each word / The number of times words appear

The first speech.txt Put it in the file directory （ You can also put it elsewhere , Then use relative path or absolute path ）

Here are three knowledge points ：

 1） Read text , Flow operation , Remember to open it. , operation （ Read or write ）, close （ Avoid memory impact ）

 2） Count the number of words in the text

3） Count the words in the text , Need to introduce jieba

f.read(...) The writing of has included close

There is no need to traverse when counting words （ Although the underlying logic is the same ）, Use the list to deduce the formula directly （ Also called grammar sugar ）

6、 From file （scores.csv） Read scores in （1000 A student ,8 Course ）, And count everyone 、 The highest score of each course 、 Lowest score 、 average 、 Total score

Students who do data analysis may be used to pandas To write , Here is also a demonstration .

use pandas Read out the data , Others follow numpy equally

I have been wondering whether there is a shortcut key to copy the current line to the next line , Who knows about it , Reply in the comment area ~