Python Learning (6)

Exercise 1:
Set a user name and password, the user entered the correct user name and password, the display login is successful, otherwise prompt logon failure, the user failed the most 3 times, or quit the program.
Tip: Use while or for to limit the number of retries, use input to get user input using? = To determine the user's user name and password.
#encoding =utf-8
Mode 1:

username = "hhq"password ="123456"for i in range(3):    user = input("please input the username: ")    passwd = input("please input the passwd: ")    if user == username and passwd == password:        print("guess ok")        break    else:        print("guess error")    if i ==2:#输错3次退出        print("input times is used out! bye!!")

Mode 2:

username = "hhq"password ="123456"for i in range(3):    user = input("please input the username: ")    passwd = input("please input the passwd: ")    if user == username and passwd == password:        print("guess ok")        break    else:        print("guess error")else:print("input times is used out! bye!!")

Exercise 2:

Implement a function yourself, find the algorithm of a word in a sentence, there is a return index number, otherwise return false
Tip: Use the coordinates in the sentence to traverse each position of the sentence, using the length of the find word to find the word in combination with the slice. Example: S[i:i+len (word)]

def findWord(s,word):    length = len(word)    for i in range(len(s)-length+1):        if s[i:i+length] == word:            return i    return -1print(findWord("I am a good boy","good"))print(findWord("I am good","good"))

Exercise 3:

Randomly generated an integer, 1-100 you guess the most 5 times, if the big guess, the hint is small, the hint is small, guessed right, prompt guess. 5 times not guessed, guess not guessed.

import randomtarget_num = random.randint(1,100)for i in range(5):    user_input_num = int(input("请输入你猜的数字: "))    if target_num == user_input_num:        print("你猜中了，数字是：",user_input_num)        print("你猜了%d 次" %i+1)        break    elif target_num > user_input_num:        print("你猜小了")    else:        print("你猜大了")    if i==4:        print("5次机会用光了 Bye")

Exercise 4:
Use while to calculate the sum of random numbers, over 100 of the time, to stop the program. The range of the random number 1-20 is generated, requiring the recording of the resulting random number, as well as the last and the number of random numbers.
Mode 1:

import randomresult =0random_num_list =[]while 1:    random_num = random.randint(1,20)    random_num_list.append(random_num )    result+=random_num    if result >100:        breakprint("一共产生了 %s 个随机数：" %len(random_num_list))print("产生随机数如下：",random_num_list)print("最后的随机数之和：",result)

Mode 2:

#encoding=utf-8import randomresult = 0number_list = []while result <= 100:    num = random.randint(1,20)    number_list.append(num)    result += numprint("产生的随机数:",number_list)print("随机数的和:",result)print("随机数的个数:",len(number_list))

Exercise 5:
Traverse strings, lists, respectively, based on location and character-based traversal

#encoding=utf-8import randoms = "abc"for i in s:    print(i)for i in range(len(s)):print(s[i])l = [1,2,3]for i in l:    print(i)for i in range(len(l)):print(l[i])

Exercise 6:
Traverse a list of nested lists and all elements of a tuple, outputting 1-12 of numbers! [[[1,2,3],4,5],7,8, (9,10, (11,12))]

import randoml = [[[1,2,3],4,5],7,8,(9,10,(11,12))]for value in l:    if isinstance(value,(list,tuple)):        for v in value:            if isinstance(v,(list,tuple)):                for j in v:                    print(j)            else:                   print(v)    else:        print(value)

Python Learning (6)