# ex24  更多的练习
print("Let's practice everything.")
# python的输出，转义字符的运用
print('You\'d need to know \'bout escapes with \\ that do:') # You'd need to know 'bout escapes with \ that do:
print('\n newlines and \t tabs.')

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

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

"""
        The lovely world
with logic so firmly planted
cannot discern
 the needs of lovely
nor comprehend passion from intuition
and requires an explanation

                where there is none.
"""

# python函数的应用，返回值可以多个
def secret_formula(started):
    jelly_beans = started * 500
    jars = jelly_beans / 1000
    crates = jars / 100
    return jelly_beans, jars, crates

start_point = 10000
# 用三个变量分别存储三个返回值
beans, jars, crates = secret_formula(start_point)

# python输出变量的方法一
print("With a starting point of: {}".format(start_point))
# python输出变量的方法二
print(f"We'd have {beans} beans, {jars} jars, and {crates} crates.")

start_point /= 10
print("We can also do that this way:")
# 用一个变量存储返回值
formula = secret_formula(start_point)
# python输出变量的方法三，将存有三个变量的变量逐个输出
print("We'd have {} beans, {} jars, and {} crates.".format(*formula))



# ex25  更多的练习
# 在命令行中运行python，然后导入该python文件（import ex25），即可使用以下这些函数
def break_words(stuff):
    """
    This function will break up words for us.
    这是一个文档注释，当我在命令行输入help(ex2.break_words)时
    会显示函数名、参数以及此文档注释
    """
    words = stuff.split(' ') # 将文本以空格分开成多个单词
    return words

def sort_words(words):
    """Sorts the words."""
    return sorted(words) # 对单词进行排序

def print_first_word(words):
    word = words.pop(0) # 取出第一个单词，此时words这个列表里会删除第一个单词
    print(word)

def print_last_word(words):
    word = words.pop(-1) # 取出最后一个单词，此时words这个列表里会删除最后一个单词
    print(word)

def sort_sentence(sentence):
    words = break_words(sentence)
    return sort_words(words)

def print_first_and_last(sentence):
    words = break_words(sentence)
    print_first_word(words)
    print_last_word(words)

def print_first_and_last_sorted(sentence):
    words = sort_sentence(sentence)
    print_first_word(words)
    print_last_word(words)