20170919习题

Posted 2020-10-07

 

ex24.py

#更多练习
print("let‘s practice everything.")
print("you\‘d need to know \‘ bout escapes with \\ that do \n newlines and \t tabs.")
#\转义符，\‘输出为‘，\\输出为\，\n输出为重新开始新一行，\t输出为tabs。

poem = """      
\t the lovely world 
with logic so firmly planted
cannot discern \n the needs of love
nor comprehend passion from intuition
and requires an explanation
\n\t\t where there is none.
"""
#poem译为诗歌


print("-----------------------")
print(poem)
print("-----------------------")

five = 10 - 2 + 3 - 6
print("this is should be five:%s" %five)

def secret_formula(started):            #定义函数，参数为started
    jelly_beans = started * 500         #函数返回三个值，为jelly_beans,jars,crates,函数定义了三个值的计算方法
    jars = jelly_beans / 1000
    crates = jars / 100
    return jelly_beans,jars,crates

start_point = 10000
beans,jars,crates = secret_formula(start_point)     #将start_point的值作为函数的参数计算三个值

print("with a starting point of:%d " %start_point)  #%d为格式化十进制整数
print("we have %d beans,%d jars and %d crates." %(beans,jars,crates))           #第一种方法：直接代入三个值输出显示结果

start_point = start_point / 10

print("we can also do that this way.")
print("we‘d have %d beans,%d jars and %d crates" %secret_formula(start_point))  #第二种方法：将函数表达式代入，计算后显示结果
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ex25.py

#更多更多的练习
def break_words(stuff):                                 #拆分东西的函数
    """this function will break up words for us."""
    words = stuff.split(" ")                            #""中间有个空格，作为分隔符。句子中间是空格，用来分隔句子内的单词
    return words                                        #返回一个叫做words的列表

def sort_words(words):                                  #将words的列表内元素分类排序的函数
    """sorts the words."""
    return sorted(words)                                #返回排序后的words列表

def print_first_word(words):                            #打印words列表的第一个单词
    """print the first word after popping it off."""
    word = words.pop(0)                                 #用pop命令提取words列表里的第一个单词赋值给word
    print(word)                                         #打印word
                                                        #pop提取的元素在列表里会去除

def print_last_word(words):                             #打印words里面内的最后一个单词的函数
    """prints the last word after popping it off."""
    word = words.pop(-1)                                #用pop命令提取单词的最后一个单词赋值给word
    print(word)                                         #打印word

def sort_sentence(sentence):                            #将句子分类的函数，与sort_words(words)函数的作用一样
    """takes in a full sentences and returns the sorted words."""
    words = break_words(sentence)                       #引用break_words函数，参数为sentence
    return sort_words(words)                            #返回排序后的words列表

def print_first_and_last(sentence):                     #打印sentence里面第一个和最后一个单词的函数
    """print the first and last words in the sentence."""
    words = break_words(sentence)                       #引用break_words函数，参数为sentence，拆分sentences赋值给words变量，为一个列表
    print_first_word(words)                             #打印words列表的第一个单词
    print_last_word(words)                              #打印words列表的最后一个单词

def print_first_and_last_sorted(sentence):              #打印排序后第一个和最后一个单词的函数
    """sorts the words then print the first and last one."""
    words = sort_sentence(sentence)                     #引用sort_sentence函数，参数为sentence，将句子内元素排序后赋值给变量words，也是一个列表
    print_first_word(words)                             #打印words列表里的第一个单词
    print_last_word(words)                              #打印words列表里的最后一个单词

#可以使用help(ex25),查询ex25模块的帮助文档（documentation comments）
#可以使用helq(ex25.break_words)，查询ex25模块内break_words函数的帮助文档
#可以在开始时输入from ex25 import * 来导入ex25模块的全部功能，便不用每次都要输入ex25
-------------------------------------------------------------------------------

ex26.py

#恭喜你，现在可以考试了
def break_words(stuff):
    """This function will break up words for us."""
    words = stuff.split(‘ ‘)
    return words

def sort_words(words):
    """Sorts the words."""
    return sorted(words)

def print_first_word(words):
    """Prints the first word after popping it off."""
    words = words.pop(0)
    print(words)

def print_last_word(words):
    """Prints the last word after popping it off."""
    words = words.pop(-1)
    print(words)

def sort_sentence(sentence):
    """Takes in a full sentence and returns the sorted words."""
    words = break_words(sentence)
    return sort_words(words)

def print_first_and_last(sentence):
    """Prints the first and last words of the sentence."""
    words = break_words(sentence)
    print_first_word(words)
    print_last_word(words)

def print_first_and_last_sorted(sentence):
    """Sorts the words then prints the first and last one."""
    words = sort_sentence(sentence)
    print_first_word(words)
    print_last_word(words)

sentence = "All good things come to those who weight."

words = break_words(sentence)
sorted_words = sort_words(words)

print_first_word(words)
print_last_word(words)
print_first_word(sorted_words)
print_last_word(sorted_words)
sorted_words = sort_sentence(sentence)
print(sorted_words)
print_first_and_last(sentence)
print_first_and_last_sorted(sentence)


print("Let‘s practice everything.")
print(‘You\‘d need to know \‘bout escapes with \\ that do \n newlines and \t tabs.‘)

poem = """
\tThe lovely world
with logic so firmly planted
cannot discern \n the needs of love
nor comprehend passion from intuition
and requires an explantion
\n\t\twhere there is none.
"""


print("--------------")
print(poem)
print("--------------")

five = 10 - 2 + 3 - 6
print("This should be five: %s" % five)

def secret_formula(started):
    jelly_beans = started * 500
    jars = jelly_beans / 1000
    crates = jars / 100
    return jelly_beans, jars, crates


start_point = 10000
beans, jars, crates = secret_formula(start_point)

print("With a starting point of: %d" % start_point)
print("We‘d have %d jeans, %d jars, and %d crates." % (beans, jars, crates))

start_point = start_point / 10

print("We can also do that this way:")
print("We‘d have %d beans, %d jars, and %d crates." % secret_formula(start_point))
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2017-09-19    23:13:35