python自学之路-进阶习题篇（一）函数篇

1.定义一个方法 func，该func可以引入任意多的整型参数，结果返回其中最大与最小的值。

def func(*num):
    for i in num:
        if not isinstance(i,int):
            return("输入的参数必须为整数")
    a=sorted(num)
    return("最大值%s,最小值%s." % (a[-1],a[0]))
print(func(1,2,3,4))

2.定义一个方法func，该func可以引入任意多的字符串参数，结果返回（长度）最长的字符串。

def func(*num):
    for i in num:
        if not isinstance(i,str):
            return("输入的参数必须为字符串")
    a=sorted(num,key=lambda k:len(k))
    return(a[-1])
print(func("123","2323","1"))

3.用lambda和filter完成下面功能：输出一个列表，列表里面包括：1-100内的所有偶数。（提示：可以用filter,lambda）

t=list(range(1,101))
a=list(filter(lambda x:x%2==0,t))
print(a)

4.用位置匹配，关键字匹配，收集匹配(元组收集,字典收集)分别写4个函数，完成功能；

传递3个列表参数：

[1,2,3],[1,5,65],[33,445,22]

返回这3个列表中元素最大的那个，结果是：445

def WzPp(a,b,c):
    if (not isinstance(a,list)) or (not isinstance(b,list)) or (not isinstance(c,list)):
        return "非列表"
    a.extend(b)
    a.extend(c)
    return max(a)
print(WzPp([1,2,3],[1,5,65],[33,445,22]))

def GjzPp(a=[],b=[],c=[]):
    if (not isinstance(a,list)) or (not isinstance(b,list)) or (not isinstance(c,list)):
        return "非列表"
    a.extend(b)
    a.extend(c)
    return max(a)
print(WzPp(b=[1,2,3],c=[1,5,65],a=[33,445,22]))

def WzPp(*arg):
    a=list(arg)
    b=[]
    for x in a:
        b.extend(x)
    return max(b)
print(WzPp([1,2,3],[1,5,65],[33,445,22]))

5.定义一个func(name)，该函数效果如下。
assert func("lilei") == "Lilei"
assert func("hanmeimei") == "Hanmeimei"
assert func("Hanmeimei") == "Hanmeimei"

def func(name):
    return name.capitalize()

assert func("lilei") == "Lilei"
assert func("hanmeimei") == "Hanmeimei"
assert func("Hanmeimei") == "Hanmeimei"

6.定义一个func(name,callback=None),效果如下。
assert func("lilei") == "Lilei"
assert func("LILEI",callback=string.lower) == "lilei"
assert func("lilei",callback=string.upper) == "LILEI"

def func(name,callback=None):
    if callback==None:
        return name.capitalize()
    else:
        return callback(name)

assert func("lilei") == "Lilei"
assert func("LILEI",callback=str.lower) == "lilei"
assert func("lilei",callback=str.upper) == "LILEI"

7.定义一个func(*kargs),效果如下。

l = func(1,2,3,4,5)
for i in l:
    print i,
#输出 1 2 3 4 5

l = func(5,3,4,5,6)
for i in l:
    print i
#输出 5 3 4 5 6

def func(*kargs):
    return kargs
l = func(1,2,3,4,5)
for i in l:
	print (i,end="")  #不换行

8.定义一个func(*kargs)，该函数效果如下。

assert func(222,1111,'xixi','hahahah') == "xixi"
assert func(7,'name','dasere') == 'name'
assert func(1,2,3,4) == None

def func(*kargs):
    a=list(filter(lambda x:isinstance(x,str),kargs))
    if a==[]:
        return None
    else:
        return a[0]

assert func(222,1111,'xixi','hahahah') == "xixi"
assert func(7,'name','dasere') == 'name'
assert func(1,2,3,4) == None

5.定义一个func(name=None,**kargs),该函数效果如下。

assert func("lilei”) == "lilei"
assert func("lilei",years=4) == "lilei,years:4"
assert func("lilei",years=10,body_weight=20) == "lilei,years:10,body_weight:20"

def func(name=None,**kargs):
    a=["%s:%s" % (x,y) for x,y in kargs.items()]
    a.insert(0,name)
    return ",".join(a)
assert func("lilei") == "lilei"
assert func("lilei",years=4) == "lilei,years:4"
assert func("lilei",years=10,body_weight=20) == "lilei,years:10,body_weight:20"


'''
def func(name=None,**kargs):
    a=[]
    for x,y in kargs.items():
        a.extend([",",str(x),":",str(y)])
    b="".join(a)
    return "%s%s" % (name,b)
assert func("lilei") == "lilei"
assert func("lilei",years=4) == "lilei,years:4"
assert func("lilei",years=10,body_weight=20) == "lilei,years:10,body_weight:20"
'''