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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 - 1 print(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_nums n = 0 eve_nums = list() while n <= 15: if n % 2 =...

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

Note Technically, .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 three school_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...

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...

#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 ...