Python learning basics string processing understanding

PythonStringProcessing
String input:

my_string = raw_input("please input a word:")

String judgment:
(1) Determine whether it is a pure letter

my_string.isalpha()

String search match:
(1) re
reregular expression Formula Example 1: ^[\w_]*$
First, \w means to match any word character including an underscore, which is equivalent to '[A-Za-z0-9_]'.
Then I followed _.
Look at the * sign again: match the previous subexpression zero or more times. For example, zo* matches "z" and "zoo". * Equivalent to {0,}.
The last is $: it means the end of the string, there are no other characters after it.
So, the meaning of this expression is to treat this [\w_] (any word character including an underscore, followed by an underscore) as a whole, appearing zero or more times!

import re
my_string = raw_input("please input a word:")
if re.match('^[a-zA-Z]$', my_string):
print "it is a word"
else:
print "it is not a word"

String transformation:
(1) Convert the string to all lowercase letters.

my_string = my_string.lower()

(2) Connect multiple strings together.

my_string = my_string + "abc"

(3) Intercept part of the string. This example removes the first and last characters and intercepts the middle section.

my_string = my_string[1:len(my_string)-1]

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