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Questions and Answers
You can iterate over a list using a while loop.
You can iterate over a list using a while loop.
True
The enumerate function is used to iterate over a range of numbers.
The enumerate function is used to iterate over a range of numbers.
False
The break statement is used to skip to the next iteration of a loop.
The break statement is used to skip to the next iteration of a loop.
False
A for loop can be used to iterate over a dictionary.
A for loop can be used to iterate over a dictionary.
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A nested loop can be used to iterate over multiple data structures.
A nested loop can be used to iterate over multiple data structures.
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The pass statement is used to exit a loop prematurely.
The pass statement is used to exit a loop prematurely.
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A while loop can be used to iterate over a range of numbers.
A while loop can be used to iterate over a range of numbers.
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The range function is used to iterate over a list.
The range function is used to iterate over a list.
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A nested loop can be used to iterate over multiple conditions.
A nested loop can be used to iterate over multiple conditions.
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Study Notes
Iterating Over Data Structures
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Lists: Iterate over elements using
forloop-
for element in list: -
for index, element in enumerate(list):(access both index and element)
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Tuples: Iterate over elements using
forloop-
for element in tuple:
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Dictionaries: Iterate over key-value pairs using
forloop-
for key, value in dictionary.items(): -
for key in dictionary.keys():(iterate over keys only) -
for value in dictionary.values():(iterate over values only)
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Loop Control Statements
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Break: Exit the loop prematurely
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breakstatement
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Continue: Skip to the next iteration
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continuestatement
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Pass: Do nothing (used as a placeholder)
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passstatement
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Nested Loops
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Nested For Loops: Iterate over multiple data structures
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for element1 in list1: -
for element2 in list2:
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Nested While Loops: Iterate over multiple conditions
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while condition1: -
while condition2:
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While Loops
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Basic Syntax:
whileconditiondosomething-
while condition: -
statement
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Infinite Loop: Use
while Trueto create an infinite loop-
while True: -
statement
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For Loops
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Basic Syntax:
forvariableiniterabledosomething-
for variable in iterable: -
statement
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Range Function: Iterate over a range of numbers
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for variable in range(start, stop, step):
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Enumerate Function: Iterate over both index and value
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for index, value in enumerate(iterable):
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Iterating Over Data Structures
- Lists can be iterated over using a
forloop with the syntaxfor element in list: - Lists can also be iterated over with both index and element using
for index, element in enumerate(list): - Tuples can be iterated over using a
forloop with the syntaxfor element in tuple: - Dictionaries can be iterated over using a
forloop with the syntaxfor key, value in dictionary.items():to access both key and value - Dictionaries can be iterated over using a
forloop with the syntaxfor key in dictionary.keys():to access only the keys - Dictionaries can be iterated over using a
forloop with the syntaxfor value in dictionary.values():to access only the values
Loop Control Statements
- The
breakstatement is used to exit a loop prematurely - The
continuestatement is used to skip to the next iteration - The
passstatement is used as a placeholder and does nothing
Nested Loops
- Nested
forloops can be used to iterate over multiple data structures - Nested
whileloops can be used to iterate over multiple conditions
While Loops
- The basic syntax for a
whileloop iswhile condition: statement - The
while Truestatement can be used to create an infinite loop
For Loops
- The basic syntax for a
forloop isfor variable in iterable: statement - The
rangefunction can be used to iterate over a range of numbers with the syntaxfor variable in range(start, stop, step): - The
enumeratefunction can be used to iterate over both index and value with the syntaxfor index, value in enumerate(iterable):
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Description
Learn how to iterate over lists, tuples, and dictionaries in Python using for loops and other methods.
