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Questions and Answers
Which data structure is defined as an unordered collection of key-value pairs?
What is the result of the expression s[-1] if s = 'Python'?
Which method would you use to convert all characters of a string s to uppercase?
If you want to split a string s into a list using a specific delimiter, which method would you use?
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Which of the following statements about strings in Python is FALSE?
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Where do the indices for characters in a string start?
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What does the function len(s) return when s = 'Hello World'?
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What is the primary purpose of the method s.strip()?
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Study Notes
Gen AI (Python) for First Year Engineering
Data Structure
- Definition: A data structure is a way to organize and store data for efficient access and modification.
-
Types:
- Lists: Ordered, mutable collections.
- Tuples: Ordered, immutable collections.
- Dictionaries: Unordered collections of key-value pairs.
- Sets: Unordered collections of unique elements.
Strings
- Definition: Strings are sequences of characters used to represent text.
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Creation: Strings can be created using single quotes, double quotes, or triple quotes for multi-line strings.
- Example:
s1 = 'Hello',s2 = "World",s3 = '''Hello World'''
- Example:
Indexing
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Concept: Each character in a string has an index, starting from 0.
- Example: In
s = "Python",s[0]is 'P',s[1]is 'y'.
- Example: In
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Negative Indexing: Allows access from the end of the string.
- Example:
s[-1]gives the last character 'n'.
- Example:
String Properties
- Immutability: Strings are immutable, meaning their contents cannot be changed after creation.
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Length: The length of a string can be obtained using
len().- Example:
len(s)returns the number of characters ins.
- Example:
String Functions and Methods
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Common Functions:
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len(s): Returns the length of the strings. -
str(): Converts other types to string.
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String Methods:
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s.lower(): Converts all characters to lowercase. -
s.upper(): Converts all characters to uppercase. -
s.strip(): Removes leading and trailing whitespace. -
s.split(delimiter): Splits the string into a list using the specified delimiter. -
s.join(iterable): Joins elements of an iterable with the string as a separator. -
s.replace(old, new): Replaces occurrences ofoldwithnew. -
s.find(substring): Returns the index of the first occurrence ofsubstringor -1 if not found.
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Summary
- Understanding data structures and strings in Python is essential for handling text and data efficiently.
- Indexing plays a crucial role in accessing individual characters.
- Familiarity with string properties and methods enhances text manipulation capabilities.
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Description
Test your knowledge on data structures and strings in Python, essential topics for first-year engineering students. This quiz covers definitions, types of data structures like lists and dictionaries, as well as string creation and indexing concepts. Enhance your understanding of how to efficiently handle data in Python.
