方法一：基础字典法（四行代码）首先，我们从基础开始，使用字典来存储字符及其出现次数：```pythonL = input() # 输入一个字符串counts = {} # 初始化一个空字典for word in L: if word in counts: counts[word] += 1 else: counts[word] = 1for i, count in counts.it...
如果要统计每个字符所占的比例，可以用字符串的长度除以每个字符的次数，然后乘以100。例如：s = "hello world" # 输入一个字符串counts = {} # 定义一个字典for word in s: # 遍历字符串中的每个字符 if word in counts: # 判断字符是否已经在字典中 counts[word] += 1 # 如果在字典中就...
defcount_duplicates(text):# 将文本按照空格进行分割,得到一个字符串列表words=text.split()# 创建一个空字典count_dict={}# 遍历列表中的每个字符串forwordinwords:# 判断字符串是否已经在字典中ifwordincount_dict:# 如果字符串已经在字典中,将其对应的值加1count_dict[word]+=1else:# 如果字符串不在字典...
defcount_occurrences(text,target):words=text.split()count=0forwordinwords:ifword==target:count+=1returncount text="Python is a powerful programming language. Python is widely used in various domains."target="Python"count=count_occurrences(text,target)print("The target string '{}' appears {} ...
count('world')) # 结果: 2 类型判断 str.isdigit():检查字符串是否只包含数字。如果是,则返回True;否则返回False。 python num = "12345" print(num.isdigit()) # 输出: True str.isalpha():检查字符串是否只包含字母。如果是,则返回True;否则返回False。 python word = "hello" print(word.isalpha())...
lst.append(word_i) new_string="".join(lst).split()returnnew_string src='/tmp/sample.txt'dic={} with open(src,'r') as f:#f.readlines()forlineinf: words_list=line.lower().split()forwordinwords_list:#str in listword = makekey(word)#return listforwordsinword:ifwordsindic.keys()...
•count:生成无限递增的整数序列。 import itertools counter = itertools.count(start=1, step=2) for i in range(5): print(next(counter)) # 输出 1, 3, 5, 7, 9 •cycle:无限循环地迭代给定序列。 import itertools colors = ["red", "green", "blue"] ...
int .count(sub[, start[, end]]返回子字符串sub in不重叠出现的次数 字符串(开始:结束)。可选参数start和end是用切片表示法解释。 """ return 0 def encode(self, *args, **kwargs): # real signature unknown """ Encode the string using the codec registered for encoding. ...
['word1', 'word2', 'word3 word4'] splitlines() 函数 功能 将字符串按行分割 用法 str.splitlines(num=string.count('\n')) 参数 num:该数值如果不为0,表示分割后的字符串中保留\n 返回值 返回分割后的 list 示例代码 str = "line1\nline2\nline3\nline4" ...
Python String: Exercise-12 with Solution Write a Python program to count the occurrences of each word in a given sentence. Sample Solution: Python Code: # Define a function named word_count that takes one argument, 'str'.defword_count(str):# Create an empty dictionary named 'counts' to ...