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Questions and Answers
How can you determine the number of items in a set?
How can you determine the number of items in a set?
You can use the len() function to find out the number of items in a set.
What characteristics define a set in Python?
What characteristics define a set in Python?
A set in Python is unordered, unchangeable, and does not allow duplicate values.
Explain how sets handle duplicate values.
Explain how sets handle duplicate values.
Sets automatically ignore duplicate values and only store unique items.
What would be the output of adding both True and 1 to a set?
What would be the output of adding both True and 1 to a set?
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If a set is unordered, what does this mean for accessing its items?
If a set is unordered, what does this mean for accessing its items?
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What does the isalpha() method check for in a string?
What does the isalpha() method check for in a string?
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How does the join() method work in Python strings?
How does the join() method work in Python strings?
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What will the expression myset = {'apple', 'banana', 'cherry'} produce in Python?
What will the expression myset = {'apple', 'banana', 'cherry'} produce in Python?
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Explain what rstrip() does when applied to a string.
Explain what rstrip() does when applied to a string.
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What is the purpose of the isnumeric() method?
What is the purpose of the isnumeric() method?
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Study Notes
String Methods
-
isalnum(): Returns True for strings with all alphanumeric characters. -
capitalize(): Converts the first character to uppercase. -
isalpha(): Returns True if all string characters are alphabetic. -
casefold(): Transforms the entire string into lowercase. -
center(): Centers the string within a specified width. -
isascii(): Returns True if all characters in the string are ASCII. -
count(): Counts occurrences of a specified value in the string. -
isdecimal(): Returns True if all characters are decimal digits. -
isdigit(): Checks if all characters are digits. -
endswith(): Returns True if the string ends with a specified value. -
isidentifier(): Returns True if the string is a valid identifier. -
expandtabs(): Sets the number of spaces per tab in the string. -
find(): Locates a specified value and returns its position. -
islower(): Checks if all characters are in lowercase. -
isnumeric(): Returns True for strings with all numeric characters. -
isprintable(): Returns True if all characters are printable. -
isspace(): Returns True for strings made up of whitespace characters. -
istitle(): Checks if the string follows title case rules. -
isupper(): Returns True if all characters are uppercase. -
join(): Combines elements of an iterable into a string. -
split(): Divides the string into a list based on a specified separator. -
ljust(): Left-aligns the string within a specified width. -
lower(): Converts the entire string to lowercase. -
lstrip(): Removes any leading whitespace from the string. -
startswith(): Checks if the string starts with a specified value. -
maketrans(): Generates a translation table for character replacements. -
partition(): Divides the string into three parts based on a separator. -
strip(): Removes leading and trailing whitespace from the string. -
replace(): Replaces a specified substring with a new value. -
swapcase(): Swaps the case of all characters in the string. -
rfind(): Searches for a specified value and returns the last occurrence position. -
rindex(): Similar to rfind() but raises an error if not found. -
rjust(): Right-aligns the string within a specified width. -
rpartition(): Similar to partition() but processes from the end of the string. -
rsplit(): Splits the string from the end based on a given separator. -
rstrip(): Removes trailing whitespace from the string. -
translate(): Applies a translation table to the string. -
upper(): Changes the entire string to uppercase. -
zfill(): Pads the string with leading zeros to reach a specified length.
Python Sets
- Sets are collections that are unordered, unchangeable, and do not allow duplicates.
- Created using curly brackets: e.g.,
myset = {"apple", "banana", "cherry"}. - Items in a set cannot be accessed via index, as they are unordered.
- Items are unchangeable post-creation, but allow for additions/deletions.
- Duplicate values in a set are ignored (e.g.,
{"apple", "banana", "cherry", "apple"}returns{'banana', 'cherry', 'apple'}). - Boolean values and integers are treated as the same value (True and 1 are considered duplicates).
- Use
len()to find the number of items in a set.
Set Data Types
- Sets can contain items of mixed data types including strings, integers, and booleans.
- Example:
set1 = {"abc", 34, True, 40, "male"}demonstrates mixed types. - Sets in Python are defined as objects with the data type
set.
Python Logical Operators
-
and: Returns True if both operands are true; e.g.,(a and b)is True if both a and b are non-zero. -
or: Returns True if at least one operand is true; e.g.,(a or b)is True if either operand is non-zero. -
not: Reverses the logical state; e.g.,not(a and b)is False if both are true.
Python Membership Operators
-
in: Returns True if a variable is found in a specified sequence (e.g.,x in y). -
not in: Returns True if a variable is not found in a specified sequence (e.g.,x not in y).
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Description
Test your knowledge on various Python string methods including isalnum(), capitalize(), and isalpha(). This quiz will help you understand how these methods work and when to use them in your programming projects. Brush up your skills and discover more about handling strings in Python.
