def has_lucky_number(nums):

    return any([num % 7 == 0 for num in nums])

def menu_is_boring(meals):

    """Given a list of meals served over some period of time, return True if the

    same meal has ever been served two days in a row, and False otherwise.

    """

    for meal in meals:

        next = meals.index(meal)+1

        try:

            if meal == meals[next] :

                return True

        except:

                return False

#     else:

#         return False

meals=['Spam', 'Eggs', 'Bacon', 'Spam']

menu_is_boring(meals)
为什么不能返回数据啊！！！
竟然用len(meals)-1来解决了。。。。

str = "123abcrunoob321"

print (str.strip( '' ))

result:

3abcrunoob3

以上下例演示了只要头尾包含有指定字符序列中的字符就删除
map(lambda x:x.strip(',.'),doc.lower().split())

dic 没有append 方法

#         2 decimal points   3 decimal points, format as percent     separate with commas

"{} weighs about {:.2} kilograms ({:.3%} of Earth's mass). It is home to {:,} Plutonians.".format(

    planet, pluto_mass, pluto_mass / earth_mass, population,

)
result:

"Pluto weighs about 1.3e+22 kilograms (0.218% of Earth's mass). It is home to 52,910,390 Plutonians."

['K']

[10 if x in'KQJ' else x for x in hand_1]