Python test Development _ string Practice

Programming Learning is a long, gradual accumulation of complexity, comprehensive difficulty of a project. Need to self-drive, urge yourself to move forward. Python Test development is the key learning goal of the year.

Today comes a string of exercises, heavy on the train of thought, constantly train their own thinking.

Title: Find the most frequently occurring character in a string and output where it appears

Code implementation:

#encoding =utf-8

s = "Aaabbbhhiijk"

letter_count_dict={}

For I in S:

If Letter_count_dict.has_key (i): #判断是否在字典中出现过

Letter_count_dict[i]+=1

else: #没出现过就是1

Letter_count_dict[i] = 1

Print Letter_count_dict

Max_letter_occurrence=max (Letter_count_dict.values ())

#所有出现次数列出来, max function takes maximum value

Print Max_letter_occurrence

Max_occurrence_letters=[]

#空列表用来存储, because there could be 1 or more

For k,v in Letter_count_dict.items ():

If v==max_letter_occurrence:

#值 = When the maximum number of times occurs

Max_occurrence_letters.append (k)

#存到列表中

Print Max_occurrence_letters #遍历

For I in Max_occurrence_letters:

Max_occurrence_letter_positions = []

#存位置的列表

Start_postion=0 #从0开始找

While 1: #死循环

If S.find (i,start_postion)!=-1: #! =-1 said he found it.

Max_occurrence_letter_positions.append (S.find (i,start_postion))

Start_postion=s.find (i,start_postion) +1 #起始位置 +1 Keep your weight back, because find won't find it again.

else: #当已查找不到目标字母来, it means all the letters have been found.

Print "%s positions:%s"% (i,max_occurrence_letter_positions)

Break #死循环需要加break

Output Result:

#{' A ': 3, ' B ': 3, ' I ': 2, ' H ': 2, ' K ': 1, ' J ': 1}

#3

#[' A ', ' B ']

#a positions:[0, 1, 2]

#b positions:[3, 4, 5]

Python test Development _ string Practice