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Questions and Answers
When opening a file for reading, what happens if the file does not exist?
When opening a file for reading, what happens if the file does not exist?
- A new file is created
- An error occurs (correct)
- All of the mentioned
- The existing file is overwritten with the new file
Which built-in functions are used to read a line of text from standard input in Python?
Which built-in functions are used to read a line of text from standard input in Python?
- Input & Scan
- Scanner
- Raw_input & Input (correct)
- Scan & Scanner
What is the output of the program 'str = raw_input("Enter your input: "); print 'Received input is : ', str'?
What is the output of the program 'str = raw_input("Enter your input: "); print 'Received input is : ', str'?
- Enter your input: Hello Python Received input is : Hello
- None of the mentioned
- Enter your input: Hello Python Received input is : Hello Python (correct)
- Enter your input: Hello Python Received input is : Python
What is the output of the program 'str = input("Enter your input: "); print 'Received input is : ', str'?
What is the output of the program 'str = input("Enter your input: "); print 'Received input is : ', str'?
When you open a file for writing and the file already exists, what happens?
When you open a file for writing and the file already exists, what happens?
What is the correct way to open a file c:\scores.txt for reading?
What is the correct way to open a file c:\scores.txt for reading?
What is the correct way to open a file c:\scores.txt for writing?
What is the correct way to open a file c:\scores.txt for writing?
What is the correct way to open a file c:\scores.txt for appending data?
What is the correct way to open a file c:\scores.txt for appending data?
What does the 'w' indicate when used to open a file?
What does the 'w' indicate when used to open a file?
Which of the following is the correct way to specify a file path in Python?
Which of the following is the correct way to specify a file path in Python?
Which of the following is considered a primitive data type in computer science?
Which of the following is considered a primitive data type in computer science?
What type of values are almost always associated with primitive data types?
What type of values are almost always associated with primitive data types?
Which type of operations on primitive data types is usually quite efficient?
Which type of operations on primitive data types is usually quite efficient?
What is the one-to-one correspondence that primitive data types native to the processor have with objects in the computer's memory?
What is the one-to-one correspondence that primitive data types native to the processor have with objects in the computer's memory?
Which type of instructions can some processors offer to process sequences of characters with a single instruction?
Which type of instructions can some processors offer to process sequences of characters with a single instruction?
What is the purpose of a boolean data type in programming?
What is the purpose of a boolean data type in programming?
What does the 'bool' type typically represent in programming languages?
What does the 'bool' type typically represent in programming languages?
Which type of numbers are stored internally in a format equivalent to scientific notation?
Which type of numbers are stored internally in a format equivalent to scientific notation?
What do signed integers allow in their range of values?
What do signed integers allow in their range of values?
Which type of data is typically denoted as 'bool' or 'boolean' in programming?
Which type of data is typically denoted as 'bool' or 'boolean' in programming?
Study Notes
File Input/Output
- If a file does not exist when opening it for reading, an error occurs
- The built-in functions
input()andraw_input()are used to read a line of text from standard input in Python raw_input()is used for Python 2.x, whileinput()is used for Python 3.x
Program Output
- The output of the program
str = raw_input("Enter your input: "); print 'Received input is : ', stris the input provided by the user, printed as a string - The output of the program
str = input("Enter your input: "); print 'Received input is : ', stris also the input provided by the user, but it evaluates the input as a Python expression (in Python 2.x, useraw_input()for string input)
File Operations
- When opening a file for writing and the file already exists, the file is overwritten
- To open a file
c:\scores.txtfor reading, useopen('c:\\scores.txt', 'r') - To open a file
c:\scores.txtfor writing, useopen('c:\\scores.txt', 'w') - To open a file
c:\scores.txtfor appending, useopen('c:\\scores.txt', 'a') - The 'w' indicator when used to open a file means the file will be written to, overwriting any existing content
Primitive Data Types
- In computer science, primitive data types include integers, floating-point numbers, and characters
- Primitive data types are associated with single values
- Operations on primitive data types are usually quite efficient
- Primitive data types have a one-to-one correspondence with objects in the computer's memory
- Some processors offer instructions to process sequences of characters with a single instruction
Boolean Data Type
- The purpose of a boolean data type in programming is to represent true or false values
- The 'bool' type typically represents true or false values in programming languages
- Boolean data types are typically denoted as 'bool' or 'boolean'
Numeric Data Types
- Floating-point numbers are stored internally in a format equivalent to scientific notation
- Signed integers allow for negative values in their range of values
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Description
Test your knowledge of file handling in Python with this multiple choice quiz. From opening files for reading and writing to understanding file modes, this quiz covers various aspects of file manipulation in Python.
