String practice of data types

First question: known string a = "Aasmr3idd4bgs7dlsf9eaf", change the uppercase of a string to lowercase and lowercase to uppercase.

1 defHandle_str (Params,*arg,**args):#for the robustness of the function, define *arg,**args extra parameters to be passed here .2result="'3     ifIsinstance (PARAMS,STR):#robustness of functions, judging the type of input parameters4          foreachinchparams:5             ifEach.isalpha ():6                 ifeach.isupper ():7result=result+Each.lower ()8                 Else:9result=result+Each.upper ()Ten             Else: Oneresult=result+ each A         returnresult -     Else: -         return 'This function requires a string type of data' the assertHANDLE_STR ([1,2,3],5) = ='This function requires a string type of data' - PrintHANDLE_STR ([1,2,3],5) - assertHANDLE_STR ('A12CD')=='A12CD'  - PrintHANDLE_STR ('A12CD')         + PrintHandle_str (a)

The function you define yourself must clearly understand what the function is entering, what it outputs, for robustness, the necessary type checking, the exception catching,

Second question: Please take the number of a string out and output it as a new string.

1 defGet_int (Params,*arg,**args): #*arg,**args receives extra arguments2result="'3     ifIsinstance (PARAMS,STR):#parameter type judgment4          foreachinchparams:5             ifeach.isdigit ():6result=result+ each7         returnresult8     Else:9         return 'This function requires a string type of data'Ten assertGet_int ('a1b4c5d67', 2,3,4,5) = ='14567' One PrintGet_int ('a1b4c5d67', 2,3,4,5) A assertGet_int ([1,2],[1,2],[1,2]) = ='This function requires a string type of data' - assertGet_int (a) = ='This function requires a string type of data' - PrintGet_int (A) the PrintGet_int (a)

Question three: Count the occurrences of each letter that appears in a string (ignoring case, A is the same as a letter) and outputting it as a dictionary. Example {' A ': 4, ' B ': 2}

1 defCount_alp_times (Params,*arg,**args):#define *arg,**args to receive redundant parameters2Dict_count={}3     ifisinstance (PARAMS,STR):4          foreachinchparams:5             ifEach.isalpha ():6Loweach=each.lower ()#converts characters in a string to lowercase7                 ifLoweach not inchDict_count.keys ():#determines whether a character exists in the dictionary key8Dict_count[loweach]=19                 Else:TenDict_count[loweach]+=1 One         returnDict_count A     Else: -         return 'This function requires a string type of data'  - PrintCount_alp_times (a)

Question Fourth: Remove the letters that appear multiple times in a string, leaving only the one that appears first. Example ' Abcabb ', after removal, output ' abc '

1 defNo_repeat_str (params,*arg,**args):2str_list=[]3     ifisinstance (PARAMS,STR):4          foreachinchparams:5             ifeach not inchstr_list:6 str_list.append (each)7         return "'. Join (str_list)8     Else:9         return 'This function requires a string type of data' Ten assertNO_REPEAT_STR ('Abcadeys')=='Abcdeys' One PrintNO_REPEAT_STR ('Abcadeys')

Question Fifth: Please invert the A string and output it. Example: ' abc ' reversal is ' CBA ', a = ' aasmr3idd4bgs7dlsf9eaf '

1 " Aasmr3idd4bgs7dlsf9eaf " 2 # Convert a string to a list 3 # use the flip function of a list 4 Print ". Join (list_a)# Join function that uses string

Question sixth: After removing the number within a string, reorder the words in the string (A-Z) and re-export a sorted string. (Case-preserving, a-to-a-order relationship is: A is in front of a.) Example: AaBb)

1 defStr_sorted (Params,*arg,**args):#*,** receiving redundant parameters2result="'3     ifIsinstance (PARAMS,STR):#parameter type judgment4          foreachinchparams:5             ifEach.isalpha ():6result=result+ each7m=sorted (Result)#using sorted to sort strings from small to large8         return "'. Join (sorted (m,key=string.upper))#use the key keyword in the sorted built-in function to implicitly manipulate each item of an iteration object

Question seventh: At this time the word judgment, from ' Boy ' to four, is ' Boy ', ' Girl ', ' bird ', ' dirty ', please determine if each letter in these 4 strings appears in a string.

1 defFind_alp_many (target,sourse):2      foreachinchTarget#iterate through all the objects you want to find3         if  notIsinstance (EACH,STR):#determine the data type of each object to be looked up, filtering the non-string form of the4             return 'Not all items are string type'5         Else:6              forEachalpinchEach :7                 ifEachalp not inchSourse:#each item is searched8                     return 'Find%s not all Alpha was in Sourse'% each9     Else:Ten         return 'All Alpha in Sourse' OneA='ABCDYSOGIRDGTL' A assertFind_alp_many ([' Boy','Girl','Bird','Dirty'],a) = ='All Alpha in Sourse' - PrintFind_alp_many ([' Boy','Girl','Bird','Dirty'],A)

Question eighth: Output a string with the highest frequency of letters

1A ="Aasmr3idd4bgs7dlsf9eaf"2Dict_a={}3  foreachinchA:4     ifEach.isalpha ():5         ifeach not inchDict_a.keys ():6Dict_a[each]=17         Else:8Dict_a[each]+=19             TenData=Dict_a.items () One PrintSorted (data,key=LambdaX:x[1],reverse=true)

String practice of data types