8.6 Chapter summary
Highlights from this chapter include:
- A string is a sequence of characters.
- Logical operators can be used to compare two string values. String comparison is done by comparing corresponding ASCII values of characters in the order of appearance in the string.
- String indexing is used to access a character or a sequence of characters in the string.
- String objects are immutable.
- String splicing.
At this point, you should be able to write programs dealing with string values.
| Method | Description |
|---|---|
len | Returns the string length. |
upper | Returns uppercase characters. |
lower | Returns lowercase characters. |
count | Returns the number of a given substring in a string. |
find | Returns the index of the first occurrence of a given substring in a string. If the substring does not exist in the string, -1 is returned. |
index | Returns the index of the first occurrence of a given substring in a string. If the substring does not exist in the string, a ValueError is returned. |
format | Used to create strings with specified patterns using arguments. |
join | Takes a list of string values and combines string values into one string by placing a given separator between values. |
split | Separates a string into tokens based on a given separator string. If no separator string is provided, blank space characters are used as separators. |
| Operator | Description |
in | Checks if a substring exists in a string. |
in operator in a for loop |
for character in string:
# loop body |
Adapted from Introduction to Python Programming by OpenStax (openstax.org), licensed under CC BY-NC-SA 4.0. Changes were made. License: CC-BY-NC-SA-4.0.