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This article shows you what the common manipulation of strings in Python is, which is concise and easy to understand, which will definitely brighten your eyes. I hope you can get something through the detailed introduction of this article.

Today's Python practice time, let's take a look at three exercises related to string manipulation. Mainly practice the conversion and splicing of several common string functions and string numbers.

Question 1

Write a program to complete the following functions: enter a mixed letter and number sentence, determine how many letters, how many numbers, and output.

Give an example

Input: hello world! 123

Output:

LETTERS 10

DIGITS 3

Topic analysis

To judge which are numbers and which are letters in a sentence, you only need to use the function that comes with the string. Then judge through a loop, and save the corresponding type of numbers in a dictionary.

Reference s = input ("input:")

D = {"DIGITS": 0, "LETTERS": 0} # defaults to 0

For c in s:

If c.isdigit ():

D ["DIGITS"] + = 1

Elif c.isalpha ():

D ["LETTERS"] + = 1

Print ("LETTERS", d ["LETTERS"])

Print ("DIGITS", d ["DIGITS"])

Question 2

Write a program to complete the following functions: enter a mixed letter and number sentence, determine how many letters, how many numbers, and output.

Give an example

Enter: hello World!

Output:

UPPER CASE 1

LOWER CASE 9

Topic analysis

This topic is similar to the previous one. Knowledge no longer judges numbers or letters, but here determines whether they are uppercase or lowercase. Considering the expansibility of the program, the answer framework of the previous question does not need to be changed, only need to change the judgment function, and the corresponding input and output can be slightly modified.

Reference: s = input ("input:")

D = {"UPPER CASE": 0, "LOWER CASE": 0}

For c in s:

If c.isupper ():

D ["UPPER CASE"] + = 1

Elif c.islower ():

D ["LOWER CASE"] + = 1

Print ("UPPER CASE", d ["UPPER CASE"])

Print ("LOWER CASE", d ["LOWER CASE"])

Question 3

The result of a calculation spelled out according to a certain rule based on an input number. The rule here is to enter a, and the result format is: a+aa+aaa+aaaa

For example:

Enter 9

Output: 11106

Topic analysis

Here is a mixed topic of numbers and strings, which requires string splicing and string-to-number conversion. The following is stitched with the traditional c language form% s replacement and the newer f-string in python.

Reference answer 1a = input ("enter a number:")

N1 = int ('s'a)

N2 = int ("% s% s"% (a))

N3 = int ("% s%s%s"% (amam a))

N4 = int ("% s%s%s%s"%)

Print (a, n1+n2+n3+n4)

Print (int (f'{a}') + int (f'{a} {a} {a}'))

Reference answer 2a = input ("enter a number:")

Print (int (f'{a}') + int (f'{a} {a} {a}'))

The above is what the common string operations in Python are, and have you learned any knowledge or skills? If you want to learn more skills or enrich your knowledge reserve, you are welcome to follow the industry information channel.

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