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Questions and Answers
What does the method isalnum() return for the string '***&&'?
What does the method isalnum() return for the string '***&&'?
Which of the following strings will return True when using the isalpha() method?
Which of the following strings will return True when using the isalpha() method?
If the string 'h221' is passed to the isdigit() method, what will be the output?
If the string 'h221' is passed to the isdigit() method, what will be the output?
What will the islower() method return for the string 'Abc'?
What will the islower() method return for the string 'Abc'?
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For the string ' ', what will the isspace() method return?
For the string ' ', what will the isspace() method return?
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What does the method lstrip() do?
What does the method lstrip() do?
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What would be the output of str.lstrip('Py') if str = 'Python Program'?
What would be the output of str.lstrip('Py') if str = 'Python Program'?
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Which of the following methods removes trailing whitespace from a string?
Which of the following methods removes trailing whitespace from a string?
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If str = ' Green Revolution ', what does str.strip() return?
If str = ' Green Revolution ', what does str.strip() return?
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What output does the command st.rstrip('ser') return for st = 'Computers'?
What output does the command st.rstrip('ser') return for st = 'Computers'?
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What does the first code segment count in the input string?
What does the first code segment count in the input string?
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In the second code segment, what is stored in the variable 'lword'?
In the second code segment, what is stored in the variable 'lword'?
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What logical structure does the third code segment utilize to check if a string is a palindrome?
What logical structure does the third code segment utilize to check if a string is a palindrome?
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In the string transformation example, what happens to uppercase letters at even indices?
In the string transformation example, what happens to uppercase letters at even indices?
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What is the final output of the string MyText after the transformation process?
What is the final output of the string MyText after the transformation process?
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What does the find() function return when the substring is not found in the string?
What does the find() function return when the substring is not found in the string?
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What will be the result of the expression 'hello'.find('l', 3)?
What will be the result of the expression 'hello'.find('l', 3)?
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Which statement correctly describes the behavior of the index() function?
Which statement correctly describes the behavior of the index() function?
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What does the endswith() function return when the specified substring matches the end of the string?
What does the endswith() function return when the specified substring matches the end of the string?
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Which of the following will yield False when checked with startswith() for the string 'Machine Learning'?
Which of the following will yield False when checked with startswith() for the string 'Machine Learning'?
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If the input string is 'hello', what will the output be for str.isalnum()?
If the input string is 'hello', what will the output be for str.isalnum()?
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What will str.count('Hello') return if the string is 'Hello, Hello, hello'?
What will str.count('Hello') return if the string is 'Hello, Hello, hello'?
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Which of the following statements about the isalnum() function is correct?
Which of the following statements about the isalnum() function is correct?
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What will be the output of the expression ord('C')?
What will be the output of the expression ord('C')?
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What does the split() method do when the input is 'apple,banana,cherry' with a separator of ','?
What does the split() method do when the input is 'apple,banana,cherry' with a separator of ','?
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When using the toggle case method on the string 'Hello World!', what will be the output?
When using the toggle case method on the string 'Hello World!', what will be the output?
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What does the expression str1[2:6] return for the string 'HAPPINESS'?
What does the expression str1[2:6] return for the string 'HAPPINESS'?
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How many spaces will be counted by the program that inputs the string 'This is a test'?
How many spaces will be counted by the program that inputs the string 'This is a test'?
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What will the output be if the function is called with the argument chr(97)?
What will the output be if the function is called with the argument chr(97)?
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In Python, how can you create an immutable string?
In Python, how can you create an immutable string?
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What is the result of running the program that replaces spaces with hyphens on the input 'Python is fun'?
What is the result of running the program that replaces spaces with hyphens on the input 'Python is fun'?
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Which of the following escape sequences represents a tab in a string?
Which of the following escape sequences represents a tab in a string?
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Which string will be returned by the function that removes capital vowels from the string 'Beautiful Day'?
Which string will be returned by the function that removes capital vowels from the string 'Beautiful Day'?
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What will the output be for the expression x[1:6:2] when x='COmpUtER'?
What will the output be for the expression x[1:6:2] when x='COmpUtER'?
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What will happen if you try to assign a new value directly to a string variable like St1 = 't' after declaring St1 = 'Information'?
What will happen if you try to assign a new value directly to a string variable like St1 = 't' after declaring St1 = 'Information'?
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What does the program count when it is tasked with counting how many words start with vowels in the string 'An apple a day'?
What does the program count when it is tasked with counting how many words start with vowels in the string 'An apple a day'?
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What does the output of print(x[-1]) return when x='COmpUtER'?
What does the output of print(x[-1]) return when x='COmpUtER'?
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Which of the following correctly assigns the message 'Hello, "How are you"?' to a variable in Python?
Which of the following correctly assigns the message 'Hello, "How are you"?' to a variable in Python?
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What does the expression print(str1[-3:-8:-1]) return when str1='HAPPINESS'?
What does the expression print(str1[-3:-8:-1]) return when str1='HAPPINESS'?
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Study Notes
String Indexing
- Strings are sequences of characters.
- Characters are indexed using positive integers (left to right) or negative integers (right to left).
- The first character has index 0.
- Negative indices count from the end of the string (-1 for the last character).
String Immutability
- Strings are immutable data types.
- Once a string is created, it cannot be changed.
- Trying to modify a character in a string results in an error.
String Operations
- Concatenation: Joining strings together.
- Repetition: Repeating a string a certain number of times.
- Membership: Checking if a character or substring is part of a string (returns True or False).
String Slicing
- Slicing extracts parts of a string.
- General format:
str[startIndex:endIndex]. -
startIndexis inclusive,endIndexis exclusive. - Omitting
startIndexstarts from the beginning. - Omitting
endIndexgoes to the end.
Built-in String Functions
-
len(): Returns the length of a string. -
capitalize(): Capitalizes the first letter of a string. -
title(): Capitalizes the first letter of each word in a string. -
lower(): Converts a string to lowercase. -
upper(): Converts a string to uppercase. -
count(): Counts the occurrences of a substring in a string (can include start and end indices). -
find(): Finds the index of the first occurrence of a substring (returns -1 if not found). -
index(): Similar tofind(), but raises an exception if the substring is not found. -
startswith(): Checks if a string starts with a specified substring (returns True or False). -
endswith(): Checks if a string ends with a specified substring (returns True or False). -
isalnum(): Checks if a string consists of alphanumeric characters (returns True or False). -
isalpha(): Checks if a string consists only of alphabets (returns True or False). -
isdigit(): Checks if a string consists only of digits (returns True or False). -
islower(): Checks if a string consists only of lowercase letters (returns True or False). -
isupper(): Checks if a string consists only of uppercase letters (returns True or False). -
isspace(): Checks if a string consists only of whitespace characters (returns True or False). -
lstrip(): Removes leading whitespace characters. -
rstrip(): Removes trailing whitespace characters. -
strip(): Removes both leading and trailing whitespace characters. -
split(): Splits a string into a list of substrings based on a separator. -
ord(): Returns the ASCII/Unicode value of a character. -
chr(): Returns the character corresponding to a given ASCII/Unicode value.
String Programs
- Various programs demonstrate string manipulations including counting spaces, toggling case, replacing spaces with hyphens, removing capital vowels and more.
Escape Sequences
- Used to represent special characters within strings using backslashes.
-
\n(newline) -
\t(tab) -
\"(double quote) -
\'(single quote)
-
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Description
This quiz covers essential concepts of string indexing, immutability, and various string operations in programming. It includes topics such as concatenation, repetition, and slicing, providing a thorough understanding of how strings function in code. Test your knowledge on built-in string functions and their applications.
