How to count the number of letters in a string in Python?

Method: First use "str_count = 0" to define the initial number of characters of letters as 0; then traverse the string, determine the type of each character in the string, and accumulate the number of letters; finally use "print ('letters = %d' %(str_count))" just output the number of letters.

Python counts the number of letters in a string

Given a string, count the numbers in it , letters and other types of characters;

For example: input "254h!%he", output: numbers = 3, letters = 3, others = 2

Method:

① First use "str_count = 0" to define the initial number of characters of letters as 0

② Then traverse the string and determine the type of each character in the string. And accumulate the number of letters;

③Finally use "print('letters = %d' %(str_count))" to output the result of the number of letters.

Initial number of digits

int_count = 0

Initial number of letters

str_count = 0

Initial number of other characters

other_count = 0

Input string

a = input(‘please input a str\n’)

Traversing strings

for i in a:
# 判断是否为数字
if i.isdigit():
int_count += 1
# 判断是否为字母
elif i.isalnum():
str_count += 1
# 判断为其他字符
else:
other_count += 1
print(‘数字 = %d, 字母 = %d，其他 = %d’ %( int_count ,str_count,other_count))

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