Python String

See a list of methods that can be used on strings. Review string literal syntax.

String. The forest air is cold. Suddenly an owl appears and perches on a log. It drops a message and flies away. You take the paper and find it has string data on it.

String methods. The mysterious owl most likely does not code Python well. But this should not stop you. Here are some common string methods.ascii capitalize casefold count endswith find format in index isalnum islower istitle isupper join len ljust lower lstrip maketrans partition replace rfind rindex rjust rsplit rstrip split splitlines startswith string.ascii_letters string.ascii_lowercase string.ascii_uppercase string.digits string.punctuation string.whitespace strip title translate upper + (Operator)* (Operator)== (Operator)!= (Operator)

Literals. In Python a string literal can be triple-quoted—this can make adding newlines easier. A raw literal (r) is useful for Windows paths.Literals: triple-quoted Literals: f (format)Literals: r (raw)

For-loop, characters. With a for-loop, we can iterate over the characters in a string. In loops we can use "in" or the range() built-in.String: for

Substring. We take substrings with the slice syntax. No substring method exists. We cannot assign a slice in a string, but we can concatenate slices together.String: Substring String: Right

Ord, chr. Often we have one-character strings. We can convert these strings into integers with ord. And with chr we convert an integer to a 1-char string.ord, chr

Textwrap. This is a helpful module included with Python. Textwrap offers a line-breaking algorithm. This can help with console output.Textwrap

Markup. There is no one way to parse HTML. A popular approach is to use the html.parser module. From it, we access the HTMLParser type. We build a class that inherits from HTMLParser.HTML HTML: Remove HTML Tags XML

Ciphers. These are one kind of string algorithm. They change the values of characters in a string. One common cipher is the ROT13 algorithm.Cipher: ROT13 Cipher: Caesar

Reverse, sort letters. A string can be sorted and reversed. We use list comprehension on the string to get a list of its characters. And then we can use sort() or reverse().Letters: Reverse Letters: Sort

StringIO. This is a buffer that can be used to quickly generate a large string. In my benchmarks, StringIO is faster for appending many strings in a loop.StringIO

ASCII table. In Python (as in all computer languages) we represent letters with numbers. This is a system called ASCII. We can generate an ASCII table with Python.ASCII Table

String handling, lists. Python makes string handling simple. It considers text handling one of its core purposes. Strings are often used in lists.String List

Strings are great. But Python also introduces regular expressions for textual processing. These text expressions are best used for complex pattern-matching.

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