Python-Basic exercises for getting started (with some simple libraries)

Here is a small exercise for getting started with Python basics with simple library usage:

• Output the current date and time
  Requirements: Output the current date and time, and format the output.

from datetime import datetime

now = datetime.now()
print("Current date and time: ", now.strftime("%Y-%m-%d %H:%M:%S"))

• Generate random numbers
  Requirements: Use the random library to generate a random integer between 1 and 100.

import random

num = random.randint(1, 100)
print(num)

• Count the number of occurrences of elements in a list
  Requirements: Enter a list and count the number of occurrences of each element in it.

from collections import Counter

lst = [1, 2, 2, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 5]
counter = Counter(lst)
print(counter)

• Determine whether a number is a prime number
  Requirements: Input a positive integer and determine whether it is a prime number.

num = int(input("输入一个数字: "))
is_prime = True
for i in range(2, num):
    if num % i == 0:
        is_prime = False
        break
if is_prime:
    print(num, "是质数")
else:
    print(num, "不是质数")

• Count the number of occurrences of each word in a string
  Requirements: Enter a string and count the number of occurrences of each word in it.

str = "this is a test string for testing purposes"
word_counts = {
    
    }
words = str.split()
for word in words:
    if word in word_counts:
        word_counts[word] += 1
    else:
        word_counts[word] = 1
print(word_counts)

• Sort a list
  Requirement: Enter a list, sort it in ascending or descending order.

lst = [5, 2, 8, 1, 9, 3]
sort_type = input("Enter 'asc' for ascending or 'desc' for descending: ")
if sort_type == 'asc':
    sorted_lst = sorted(lst)
elif sort_type == 'desc':
    sorted_lst = sorted(lst, reverse=True)
else:
    print("Invalid input")
print(sorted_lst)

Finally—————— Learning Python is a challenge, but it is also an opportunity to grow. Persevere, you will see the process of your continuous improvement, come on