Original: http://coolketang.com/staticCoding/5a992500a22b9d00443914e9.html
1. We can use a tuple type as the return type of the function to return a tuple with multiple values as the return value of the function.
2. Create a function that has a tuple as the return type. A tuple is a set of comma-separated values enclosed in parentheses.
3. Define three variables with an initial value of 0 in turn to store vowels, consonants and other letters.
4. Add a loop statement to iterate over all characters in a string.
5. Use conditional statements to judge each character. Before judging, first convert the character to a string, and then call the lowercase method to convert the letter to the lowercase style.
6. When a letter in the string is a vowel, increment the vowel variable by 1.
7. When a letter in the string is a consonant, increment the consonant variable by 1.
8. When the letters in the string are not vowels and consonants, increment the value of the third variable by 1.
9. At the end of the function, return a tuple of three variables.
10. Finally call the function. As can be seen from the right side of the code in line 25, the number of vowels is 3 and the number of consonants is 7.
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