day9 函数练习题

写代码，接受n个数字，求这些数字的和

 def sum_func(*args):
     total = 0
     for i in args:
         total+=i
     return total
 print(sum_func(1,2,3,44,5,5,87,1,25))

读代码 打印出的a，b，c分别是多少

 a = 10
 b = 20
 def test5(a,b):
     print(a,b)
 c = test5(b,a)
 print(c)
 print(a)
 print(b)
 # c = None ,10 a = 10 b = 20

读代码 打印出的a，b，c分别是多少

 a = 10
 b = 20
 def test5(a,b):
     a = 3
     b = 5
     print(a,b)
 c = test5(b,a)
 print(c)
 print(a)
 print(b)
  # c = None a = 10 b = 20

写函数，检查获取传入的列表或者元祖的所有奇数索引对应的元素，返回回去

 def func(l):
     return l[1::2]
 print(func([1,2,3,4,5,6,7,8]))

 写函数，判断用户传入的对象（列表，字符串，元祖）是否长度大于5

 def func(l):
     # l = [True  if len(l)> 5 else False]
     # return l
     return len(l)>5
 print(func("sdsadhk"))

写函数，如果的长度大于2，仅保留两个长度内容并返回回去

 def func(l):
     # l = [l[0:2] if len(l)>2 else False]
     # return l
     return l[:2]
 print(func("sdsadhk"))

写函数，计算传入字符串中的数字，字母，空格，以及其他的个数返回结果

 def func(l):
     dic = {"num":0,"alpha":0,"space":0,"other":0}
     for i in l:
         if    i.isdigit():dic["num"]+=1
         elif i.isalpha():dic["alpha"]+=1
         elif i.isspace():dic["space"]+=1
         else:dic["other"]+=1
     return dic
 print(func("shdah sdkah.sdha123 ..sihdao"))

 写函数，检查用户传入的对象是否含有空内容，并返回结果

 def  func(x):
     if    type(x) is str and x :
         for i in x  :
             if i == " ":return True
     elif x and type(x) is list or type(x) is tuple:
         for i in x:
             if not i:return True
     elif not x :return True
     else : return True
 print(func("shkahk shdalh"))
 print(func([1,2," ",[],]))
 print(func((1,2,[],)))
 print(func([]))

写函数，检查传入字典的每个value的长度，长度大于2仅保留两个长度的内容，返回给调用者

 def     func(dic):
     for k in dic:
         if len(dic[k]) > 2:
             dic[k] = dic[k][:2]
     return dic
 dic = {"k2":"shdahdkl","wc":[1,2,3,4,5,6]}
 print(func(dic))

 写函数，用户传入修改的文件名字，以及要修改的内容，
　　执行函数，完成整个文件的批量修改操作

 def func(filename,old,new):
     with open(filename,encoding="utf-8") as f, open("%s.bak" %filename,"w",encoding="utf-8") as f2:
         for line in f:
             if old in line:
                 line = line.replace(old,new)
             f2.write(line)
     import os
     os.remove(filename)
     os.rename("%s.bak" %filename,filename)