下面是示例代码: importredefcount_digits(string):pattern=r'\d'# 匹配数字的正则表达式matches=re.findall(pattern,string)returnlen(matches)# 示例用法string="hello123world456"digit_count=count_digits(string)print("字符串中的数字个数:",digit_count) 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. ...
defis_in(full_str,sub_str):returnfull_str.count(sub_str)>0print(is_in("hello, python","llo"))# Trueprint(is_in("hello, python","lol"))# False 5、通过魔法方法 在第一种方法中,我们使用 in 和 not in 判断一个子串是否存在于另一个字符中,实际上当你使用 in 和 not in 时,Python解释...
对于每个字符,我们使用isdigit()方法检查它是否是一个数字字符。如果是数字字符,则将计数器count加1。最后,函数返回计数器的值。 然后,我们使用input()函数提示用户输入一个字符串,并将其保存在变量string中。接下来,我们调用count_digits函数,并将输入的字符串作为参数传递给它。函数返回的数字个数保存在变量num_dig...
Other methods give you information about the string itself. The methodcountreturns how many times a given substring appears within a string. The methodendswithreturns whether the string ends with a certain substring, whereas the methodstartswithreturns whether the string started with a substring: Ano...
1.>>> str='stRINg lEArn' 2.>>> 3.>>> str.center(20) #生成20个字符长度,str排中间 4.' stRINg lEArn ' 5.>>> 6.>>> str.ljust(20) #str左对齐 7.'stRINg lEArn ' 8.>>> 9.>>> str.rjust(20) #str右对齐 10.' stRINg lEArn' ...
rfind(sub[,start[,end]]):类似于find()函数,不过是从右边开始查找。rindex(sub[,start[,end]]):类似于index(),不过是从右边开始。replace(old,new[,count]):用来替换字符串的某些子串,用new替换old。如果指定count参数话,就最多替换count次,如果不指定,就全部替换...
```python def count_chars(input_string): letters = 0 spaces = 0 digits = 0 others = 0 for char in input_string: if char.isspace(): spaces += 1 elif char.isalpha(): letters += 1 elif char.isdigit(): digits += 1 else: others += 1 ...
letters+'_' nums=string.digits print 'Welcome to the Identifier Checker v1.0' print 'Testees must be at least 2 chars long.' myInput=raw_input('Identifier to test') if len(myInput)>1: if myInput[0] not in alphas print '''invalid:first symbol must be alphas''' else: for other...
~""" 34 printable = digits + letters + punctuation + whitespace 35 36 # Case conversion helpers 37 # Use str to convert Unicode literal in case of -U 38 l = map(chr, xrange(256)) 39 _idmap = str('').join(l) 40 del l 41 42 # Functions which aren't available as string ...
notin vowels: str2 += letter print(str2)输出：pythn问题 3.如何随机输出字符串import randomimport stringdefrandom_string(length): letters = string.ascii_letters + string.digits # 包含大小写字母和数字return''.join(random.choice(letters) for _ in range(length))print(random_string(10))以...