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This article is about how to use Python strings and regular expressions. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

String-related operations

1. Count the number of words in the input string, separated by spaces. Its running effect is shown in the following figure.

S=input ('Please enter string:') sum=1for i in s: if iTunes:': sum+=1print ('method 1:', end='') print ('total number of words there are:', sum) list=s.split ('') print ('method 2:', end='') print ('total number of words among them:', len (list))

two。 Write a program, give a string, replace the character "E" with a space and output it.

A=input ('Please enter a string:') print ('before replacement:', a) a=a.replace ('after replacement:', a) print

3. Enter a person's 18-digit ID number interactively from the keyboard to output the person's date of birth in a form similar to "September 12, 2001".

Idc=input ("Please enter ID number:") print ('date of birth: {0} year {1} month {2} day', idc [6:10], idc [10:12], idc [12:14]))

4. Output the string 'abcdefg' in reverse order using a function

List='abcdefg'print (list [::-1])

5. In our life, holiday greetings are essential, please use string formatting to write a New year greeting template.

Name=input ("Please enter your name:") print ("Happy New year to {}!" .format (name))

6. The user enters a string, combines the characters with an even subscript into a new string A, and combines the characters with an odd subscript into a new string B. the strings An and B are concatenated and output.

S=input ('Please enter a string:') A = s [0:: 2] B = s [1:: 2] print ('Achilles Magazine A) print (' Barrier Magna B) print (Atrib)

7. Please write a program according to the following requirements. If the user enters a string, please move all the letters in the string backward one bit, put the last letter at the beginning of the character, and finally output the new string.

S=input ('Please enter string:') s_new=s [- 1] + s [: len (s)-1] # s [- 1] represents the last bit of s, and s [: len (s)-1] represents the slice to the penultimate digit print (s_new)

8. Based on the input function, the input string is processed and a string with some characters replaced is returned, as follows:

If a letter is a capital consonant, replace the character with "Iron".

If the letter is a lowercase consonant or a non-alphabetic character, no action is performed on that character.

If a letter is an uppercase vowel, replace the character with "Iron Yard".

If a letter is a lowercase vowel, replace the character with "Yard".

Import retext=input ("Please enter a string:") for i in text: if iTunes: A' or iTunes'O' or iTunes'E' or iTunes'I'or iTunes' Utility: a=re.sub ('[AOEIU]', 'Iron Yard',text) if iTunes' a'or iota','o' or ionization 'e'or iatrology' e'or iatrology: a=re.sub ('[aoeiu]', 'Yard') Text) if I >'A 'and I <' Z expressions: a=re.sub ('[Amurz-[AOEIU]]', 'Iron',text) print ("replaced characters are:", a) II. Regular expression related operations

1. Write a regular expression that matches the mailbox (@ 163.com) and use the re.match method and mailbox sda123 (wer) u@163.com as test verification.

Import res=input ("Please enter your mailbox:") if re.match (ringing. Email address 163.composure Magazine s): print ('Yes') else: print ('not')

two。 All the Chinese characters are extracted from the following three strings by using the search, findall or search functions in re library, and the output results are "Dalian University of Technology", "Chongqing University" and "Central South University of Finance and Economics" respectively. (hint: there are spaces in the string st2,str3).

Str1= "" Dalian University of Technology ""

Str2= "" Chongqing University ""

Str3= "" Central South University of Economics and Law ""

Import restr1= "" Dalian University of Technology "" str2= "" Chongqing University "str3=" Central South University of Economics and Law "" re1=re.search ("(. *?)", str1) .group (1) print ('. Join (map (str,re1) re2=re.search ("(. *?) (. *?)", str2) .group (1) print (''.join (str (str)) Re2) re3=re.search ("(. *?)", str3) .group (1meme, 2meme, 3jin4) print ('.join (map (str,re3) Thank you for reading! This is the end of this article on "how to use Python strings and regular expressions". I hope the above content can be of some help to you, so that you can learn more knowledge. if you think the article is good, you can share it for more people to see!

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