Strings in Python are identified as a continuous set of characters represented in the quotation marks.We can access subset of strings using Index [] operator.
Slicing methods:
str = ‘SQLZealots’
print(‘str = ‘, str)#first character
print(‘str[0] = ‘, str[0])#last character
print(‘str[-1] = ‘, str[-1])#slicing 2nd to 5th character
print(‘str[1:5] = ‘, str[1:5])#slicing 6th to 2nd last character
print(‘str[5:-2] = ‘, str[5:-2])
we have many built in methods with strings. I have listed couple of them and have shown the o/p of each method with an example.
string.upper() # get all-letters in uppercase
string.lower() # get all-letters in lowercase
string.capitalize() # capitalize the first letter
string.title() # capitalize the first letter of words
string.swapcase() # converts uppercase and lowercase
string.strip() # remove all white spaces
string.lstrip() # removes white space from left
string.rstrip() # removes white space from right
string.split() # splitting words
string.split(‘,’) # split words by comma
string.count(‘l’) # count how many times l is in the string
string.find(‘Wo’) # find the word Wo in the string
string.index(“Wo”) # find the letters Wo in the string
“:”.join(string) # add a : between every char
” “.join(string) # add a white space between every char
len(string) # find the length of the string
Lets write a small program ,to extract the Numbers only from a given string .
You can find the SQL version of the code from here.
Hope you enjoyed the post. Please share your comments .
See also
One comment