有一道題: 比較兩個列表范圍,如果包含的話,返回TRUE,否則FALSE。 詳細題目如下:
Create a function, this function receives two lists as parameters, each list indicates a scope of numbers, the function judges whether list2 is included in list1.
Function signature:
differ_scope(list1, list2)
Parameters:
list1, list2 - list1 and list2 are constructed with strings,
each string indicates a number or a scope of
numbers. The number or scope are randomly, can
be overlapped. All numbers are positive.
E.g.
['23', '44-67', '12', '3', '20-90']
Return Values:
True - if all scopes and numbers indicated by list2 are included in list1.
False - if any scope or number in list2 is out of the range in list1.
Examples:
case1 - list1 = ['23', '44-67', '12', '3', '20-90']
list2 = ['22-34', '33', 45', '60-61']
differ_scope(list1, list2) == True
case2 - list1 = ['23', '44-67', '12', '3', '20-90']
list2 = ['22-34', '33', 45', '60-61', '100']
differ_scope(list1, list2) == False
貼上自己寫的代碼如下:(備注: python 2.7.6)
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def differ_scope(list1, list2): print "list1:" + str (list1) print "list2:" + str (list2) #設置臨時存放列表 list1_not_ = [] #用于存放列表1正常的數字值,當然要用int()來轉換 list1_yes_ = [] #用于存放列表1中范圍值如 44-67 list1_final = [] #用于存放列表1中最終范圍值 如:[1,2,3,4,5,6,7,8,9,10] temp1 = [] list2_not_ = [] #用于存放列表2正常的數字值,當然要用int()來轉換 list2_yes_ = [] #用于存放列表2中范圍值如 44-67 list2_final = [] #用于存放列表2中最終范圍值 如:[1,2,3,4,5,6,7,8,9,10] temp2 = [] temp = [] #用于存放列表1,與列表2比較后的列表,從而判斷結果為True還是False. #對列表1進行處理 for i in range ( len (list1)): #用FOR循環對列表1進行遍歷 tag = 0 if list1[i].find( '-' )> 0 : #對含范圍的數字進行處理,放到list_yes_列表中 strlist = list1[i].split( '-' ) list1_yes_ = range ( int (strlist[ 0 ]), int (strlist[ 1 ]) + 1 ) #讓其生成一個范圍列表 for each in list1_yes_: #FOR循環遍歷所有符合條件的. [temp1.append(each)] else : #對列表1中正常的數字進行處理,放到list_not_列表中 list1_not_.append( int (list1[i])) #對列表1中進行處理,放到list_yes_ [temp1.append(i) for i in list1_not_ if not i in temp1] #去除重復項 list1_final = sorted (temp1) #比較后,排序,并放到list1_final列表中 print "list1_final value is:" + str (list1_final) #打印排序后最終list1_final列表 #對列表2進行處理 for i in range ( len (list2)): if list2[i].find( '-' )> 0 : strlist = list2[i].split( '-' ) list2_yes_ = range ( int (strlist[ 0 ]), int (strlist[ 1 ]) + 1 ) for each in list2_yes_: [temp2.append(each)] print "Temp2:" + str (temp2) else : list2_not_.append( int (list2[i])) [temp2.append(i) for i in list2_not_ if not i in temp2] list2_final = sorted (temp2) print "list2_final value is:" + str (list2_final) #對兩個列表進行比較,得出最終比較結果. [temp.append(i) for i in list2_final if not i in list1_final] #比較兩個列表差值. print "In list2 but not in list1:%s" % (temp) #打印出列表1與列表2的差值 if len (temp)> = 1 : print "The result is: False" else : print "The result is: True" if __name__ = = '__main__' : list1 = [ '23' , '44-67' , '12' , '3' , '90-100' ] list2 = [ '22-34' , '33' , '45' ] differ_scope(list1,list2) |
總結:
1. 這道題關鍵是想法,如果整成坐標的方式來比較,會很麻煩。
2. 列表轉成范圍后,如果消除重復項,同樣是里面的關鍵所在。
3. 其次是對列表遍歷的操作,同樣挺重要。