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Given the same dictionary, medals, now sort by the medal count. Save the three countries with the highest medal count to the list, top_three.medals = {'Japan':41, 'Russia':56, 'South Korea':21, 'Un...

sorted(iterable[, key][, reverse])从 iterable 中的项目返回新的排序列表。有两个可选参数，必须指定为关键字参数。key 指定一个参数的函数，用于从每个列表元素中提取比较键：key=str.lower。默认值为 None （直接比较元素）。reverse 是一个布尔值。如果设置为 True，那么列表元素将按照每个比较反转进行排序。You w...

Write a function called checkingIfIn that takes three parameters. The first is a required parameter, which should be a string. The second is an optional parameter called direction with a default valu...

def f(x): return x - 1print(f)print(type(f))print(f(3))print(lambda x: x-2)print(type(lambda x: x-2))print((lambda x: x-2)(6))

1.Write a function, sublist, that takes in a list of numbers as the parameter. In the function, use a while loop to return a sublist of the input list. The sublist should contain the same values of t...

1、Write a while loop that is initialized at 0 and stops at 15. If the counter is an even number, append the counter to a list called eve_numsn = 0eve_nums = list()while n <= 15: if n % 2 =...

If you remember, the .items() dictionary method produces a sequence of tuples. Keeping this in mind, we have provided you a dictionary called pokemon. For every key value pair, append the key to the ...

Write two functions, one called addit and one called mult. addit takes one number as an input and adds 5. mult takes one number as an input, and multiplies that input by whatever is returned by addi...

Write a function called decision that takes a string as input, and then checks the number of characters. If it has over 17 characters, return “This is a long string”, if it is shorter or has 17 char...

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When a piece of data consists of a set of properties of a singleitem, a dictionary is often better. You could try to keep trackmentally that the zip code property is at index 2 in a list, butyour...

Create a dictionary called d that keeps track of all the characters in the string placement and notes how many times each character was seen. Then, find the key with the lowest value in this dictiona...

f = open('scarlet.txt', 'r')txt = f.read()# now txt is one long string containing all the charactersx = {} # start with an empty dictionaryfor c in txt: if c not in x: # we have not se...

NoteTechnically, .keys(), .values(), and .items() don’t return actual lists. Like the range function described previously, in python 3 they return objects that produce the items one at a time, rathe...

Challenge: Using the file school_prompt.txt, if the character ‘p’ is in a word, then add the word to a list called p_words.school_prompt = open('school_prompt.txt','r')chars = school_prompt.read()w...

题目：Using the file school_prompt.txt, assign the third word of every line to a list called threeschool_prompt = open('school_prompt.txt','r')chars = school_prompt.readlines()three = list()for word ...

题目：We have provided a file called emotion_words.txt that contains lines of words that describe emotions. Find the total number of words in the file and assign this value to the variable num_words.emo...

题目：Provided is a list of data about a store’s inventory where each item in the list represents the name of an item, how much is in stock, and how much it costs. Print out each item in the list with th...

#1. Open the file using with and open.#2. Use .readlines() to get a list of the lines of text in the file.#3. Use a for loop to iterate through the strings in the list, each being one line from the ...

First, using .format() makes it really clear what we’re doing when we create the variable row_string. We are making a comma separated set of values; the {} curly braces indicated where to substitute i...

题目：The textfile, travel_plans.txt, contains the summer travel plans for someone with some commentary. Find the total number of characters in the file and save to the variable num.travel_plans = open(...