1. String length
#strlen(str)
str= 'apples' # Assign the string "apples" to the variable str
print (len (str)) #Print the length of the string
2. Find characters
#strchr(str1,str2) #Find character function name
str1 = ' apples'
str2 = 'e'
result = str1.index(str2) # Find the character str2
print (result)
3 in the string str1 .Copy string
#strcpy(str1,str2) #Copy string function name
str1 = 'apples'
str2 = str1 #Assign string str1 to str2
str1 = 'bananas' #Reassign the string value to str1
print (str2)
4. Connect the string
#strcat(str1,str2) #Connection characters String function name
str1 = 'apples'
str2 = 'bananas'
str1 += str2 #String str1 is concatenated with string str2 and then assigned to str1
print (str1)
5. Case conversion in strings
str.lower() Case swap
str.capitalize() #Capitalize the first letter
#strupr(str)
str = str.upper()
print ( str)
#strlwr(str)
str = str.lower()
print (str)
6. Reverse the string
#strrev(str)
str = 'abcdefg''str = str[::-1] # Index is from the beginning to the end, Three parameters - 1 means reverse order
print (str)
7. Find the string
#strstr(str1,str2) #Find the string function name
str1 = 'abcdefg'str2 = 'cde'
print (str1.find(str2)) # Find the string str2 in the string str1
#Variable.find(
0. If it is not found, -1 will be returned.
8. String replacement
str = 'abcabcabc'
str=str.replace('a', '0') #Replace the character "a" in the string str with "0", and reassign it to strprint (str)
9. String alignment
str.ljust(n,[fillchar]) # Output n characters, str is left-aligned, and the missing part is filled with fillchar. The default is spaces.
str.rjust(n,[fillchar]) # Same as above, right alignedstr.center(n, [fillchar]) # Same as above, centered
10. Others Function
str.count(char, [start, [end]]) #Count the number of times the character char appears in the string str, you can set where to start and where to end
str.strip([chars]) #Remove all the characters before and after the character chars in str, which can be understood as replacing the chars before and after S with None
str.lstrip([chars]) #Remove the left part of the character charsstr.rstrip([chars]) #Remove the right part of the character chars
str.split([sep, [maxsplit]]) #Use sep as the delimiter, divide str into a list, maxsplit means splitting The number of times, the default separator is the blank character
str.startswith(char) #Whether it starts with char
str.endswith(char)str.isalnum() #str Whether it is all letters and numbers
Str.isalPha () #Str.isdigit () #Str.isdigit () #Str.isdigit () #Str.isspace () #Tr ##str.islower() cred Meshes _ The letters in #str are all lowercase
str.isupper() [ The first letter is capitalized
11. String slicing
str = 'abcdefghigklm′
str[0:3] #Intercept the first to third characters# "abc"
str[:] #Intercept all characters of the string# "abcdefghigklm"
str[6:] #Intercept from the seventh character to the end# "higklm"
str[:-3] #Intercept from the beginning to before the third to last character# "abcdefghig"
str[2 ] #Intercept the third character# "c"
str[-1] okaleg hand in the first character from the last to last## "m"
str[::-1] #String reverse order# "mlkgihgfedcba"
str[-3:-1] #Intercept the third to last character and the characters before the first to last# "kl"
str[-3:] #Intercept the third to last character to the end# "klm"
str[:-5:-3] #Truncate the last four characters in reverse order, and intercept every 2 characters# "mg"
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