一切很好 不缺烦恼

摘要： We have seen built-in functions that take a variable number of arguments. For example range can take one, two or three arguments.It is possible to wri... 阅读全文

摘要： To find the most common words, we can apply the DSU pattern; most_common takes a histogram and returns a list of word-frequency tuples, sorted in reve... 阅读全文

摘要： Here is a program that reads a file and builds a histogram of the words in the file: process_file loops through the lines of the file, passi... 阅读全文

摘要： Most computer programs do the same thing every time they execute, given the same inputs, so they are said to be deterministic. Deterministic is usuall... 阅读全文

摘要： Write a program that reads a file, breaks each line into words, scripts whitespace and punctuation from the words, and converts them to lowercase. Mod... 阅读全文

摘要： DSU stands for ‘decorate, sort, undecorate’ and refers to a pattern that is often useful for sorting lists according to some attribute of elements.For... 阅读全文

摘要： I have focused on lists of tuples, but almost all the examples in this chapter also work with lists of lists, tuples of tuples, and tuples of lists. T... 阅读全文

摘要： Dictionaries have a method called items that returns a list of tuples, where each tuple is a key-value pair. As you should expect from a dictionary, t... 阅读全文

摘要： zip is a built-in function that takes two or more sequence and ‘zips’ them into a list of tuples, where each tuple contains one element from each sequ... 阅读全文

摘要： Strictly speaking, a function can only return one value, but if the value is a tuple, the effect is the same as returning multiple values. For example... 阅读全文