Top Python Questions 2023 with Answers
Q1. How to order months by index after converting to names python
Ans. To order a list of month names by their corresponding index (i.e. their position in the year), you can use the following approach:
Create a list of tuples, where each tuple consists of a month name and its corresponding index.
For example:
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months = [(“January”, 1), (“February”, 2), (“March”, 3), (“April”, 4), (“May”, 5), (“June”, 6), (“July”, 7), (“August”, 8), (“September”, 9), (“October”, 10), (“November”, 11), (“December”, 12)]
Use the sorted function and specify the key function as the second element of the tuple (the index).
For example:
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sorted_months = sorted(months, key=lambda x: x[1])
This will return a new list of tuples sorted by the index in ascending order.
The resulting list will be:
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[(‘January’, 1), (‘February’, 2), (‘March’, 3), (‘April’, 4), (‘May’, 5), (‘June’, 6), (‘July’, 7), (‘August’, 8), (‘September’, 9), (‘October’, 10), (‘November’, 11), (‘December’, 12)]
You can also use the operator.itemgetter function as the key function instead of a lambda function:
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import operator
sorted_months = sorted(months, key=operator.itemgetter(1))
This will give you the same result as the previous example.
Q2. How to accept lowercase and uppercase inputs in python
Ans. To accept lowercase and uppercase input in Python, you can use the built-in input function and convert the input to lowercase or uppercase using the lower or upper method, respectively.
For example:
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# Accept input and convert to lowercase
name = input(“Enter your name: “).lower()# Accept input and convert to uppercase
name = input(“Enter your name: “).upper()
You can also use the case fold method to convert the input to a case-insensitive representation, which is useful for handling input in non-Latin scripts:
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name = input(“Enter your name: “).casefold()
Note that these methods return a new string and do not modify the original string. If you want to store the input in a different case, you will need to assign the result to a new variable.
You can then use the resulting string in your program, for example, to check if it is equal to a certain value:
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if name == “john”:
print(“Hello, John!”)
This will match the input “john”, “John”, “JOHN”, etc.
Q3. How to count how many times something appears in an str python
Ans. To count how many times a certain character or substring appears in a string in Python, you can use the count method of the str class.
Top Python Questions 2023 with Answers
For example, to count the number of occurrences of the letter “a” in a string:
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string = “The quick brown fox jumps over the lazy dog.”
count = string.count(“a”)
print(count) # prints 2
You can also use the count method to count the number of occurrences of a substring within a string. For example:
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string = “The quick brown fox jumps over the lazy dog.”
count = string.count(“the”)
print(count) # prints 2
Note that the count method is case-sensitive, so “the” and “The” will be counted as separate occurrences. If you want to perform a case-insensitive count, you can use the lower or upper method to convert the string and the substring to the same case before calling the count method.
For example:
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string = “The quick brown fox jumps over the lazy dog.”
count = string.lower().count(“the”)
print(count) # prints 3
This will count all occurrences of “the”, “The”, and “THE” in the string.
Q4. How do I write 95 times the square root of 2 in python
Ans. To write 95 times the square root of 2 in Python, you can use the sqrt function from the math module to calculate the square root of 2, and then multiply it by 95.
Here’s an example of how you can do this:
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from math import sqrtresult = 95 * sqrt(2)
print(result)
This will print the result of 95 times the square root of 2.
Alternatively, you can use the exponentiation operator (**) to calculate the square root of 2, like this:
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result = 95 * 2 ** 0.5
print(result)
This will also print the result of 95 times the square root of 2.
You can also use the Decimal class from the decimal module to perform the calculation with more precision, like this:
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from decimal import Decimalresult = 95 * Decimal(2).sqrt()
print(result)
This will print the result of 95 times the square root of 2 with more decimal places.
Top Python Questions 2023 with Answers
Q5. How to find a correlation between variables in python
Ans. To find the correlation between variables in Python, you can use the pearsonr function from the scipy.stats module. This function calculates the Pearson correlation coefficient and the p-value for testing the hypothesis that the two variables are independent.
Here’s an example of how you can use pearsonr to find the correlation between two variables:
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from scipy.stats import pearsonrx = [1, 2, 3, 4, 5]
y = [2, 3, 4, 5, 6]r, p = pearsonr(x, y)
print(f”Pearson correlation coefficient: {r:.2f}”)
print(f”p-value: {p:.3f}”)
This will print the Pearson correlation coefficient and the p-value for the variables x and y.
The Pearson correlation coefficient is a measure of the linear relationship between two variables. It ranges from -1 (perfect negative correlation) to 1 (perfect positive correlation). A value of 0 indicates no correlation.
The p-value is a measure of the statistical significance of the correlation. A small p-value (usually less than 0.05) indicates that the correlation is statistically significant, while a large p-value indicates that the correlation is not statistically significant.
You can also use other functions from the scipy.stats module to calculate other types of correlation, such as the Spearman rank correlation coefficient or the Kendall rank correlation coefficient.
Q6. How do I identify my python directory using spyder?
To identify the Python directory using Spyder, you can use the built-in sys module and the executable attribute of the sys.executable object.
Here’s an example of how you can do this:
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import syspython_dir = sys.executable
print(python_dir)
This will print the full path to the Python executable that is being used by Spyder.
Alternatively, you can use the getcwd function from the os module to get the current working directory of the Python interpreter, like this:
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import ospython_dir = os.getcwd()
print(python_dir)
This will print the current working directory of the Python interpreter, which may or may not be the same as the Python directory.
You can also use the __file__ attribute of the sys module to get the full path to the sys.py file, which is located in the Python standard library directory. For example:
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import syspython_dir = sys.__file__
print(python_dir)
This will print the full path to the sys.py file, which is located in the Python standard library directory.
Q7. How to get a text from a title using selenium python
Ans. To get the text from a title using Selenium in Python, you can use the find_element_by_tag_name method to locate the title element and the text attribute to get its text content.
Here’s an example of how you can do this:
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from selenium import webdriverdriver = webdriver.Firefox()
driver.get(“http://www.example.com”)title_element = driver.find_element_by_tag_name(“title”)
title_text = title_element.textprint(title_text)
This will print the text of the title element of the page.
Note that the find_element_by_tag_name method will return the first element with the specified tag name. If there are multiple title elements on the page, this method will only return the first one.
You can also use other methods to locate the title element, such as find_element_by_class_name, find_element_by_id, or find_element_by_css_selector, depending on how the element is identified on the page.
Once you have located the title element, you can use the text attribute to get its text content.
After you have finished working with the page, don’t forget to close the web driver instance to free up resources:
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driver.close()
Q8. when does python develop?
Ans. Python is a high-level programming language that was first released in 1991. It was developed by Guido van Rossum, a Dutch programmer, while he was working at the National Research Institute for Mathematics and Computer Science in the Netherlands.
Van Rossum had been working on the Python project since 1989, and the first version of the language (Python 0.9.0) was released in February 1991. Since then, Python has gone through several major revisions and has become one of the most popular programming languages in the world.
Python was designed to be easy to read and write, and to be as expressive as possible while still being efficient. It has a large standard library and a wide range of third-party libraries, making it a versatile and powerful language for a wide variety of applications.
Python is used in many different fields, including scientific computing, data analysis, web development, game development, and more. It is known for its simplicity, flexibility, and readability, and has a large and active community of users and developers.
Top Python Questions 2023 with Answers
Q9. How to package a python app
Ans. To package a Python app, you can use the pyinstaller module, which is a tool that converts Python scripts into standalone executables.
Here’s an example of how you can use pyinstaller to package a Python app:
Install pyinstaller using pip:
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pip install pyinstaller
Run pyinstaller on your Python script, specifying the name of the script as an argument:
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pyinstaller myapp.py
This will create a dist directory containing the packaged app. The app will be bundled with all of the necessary Python modules and libraries, so it can be run on a machine that does not have Python installed.
By default, pyinstaller will create a console-based executable. If you want to create a GUI-based executable, you can use the –windowed option.
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pyinstaller –windowed myapp.py
You can also use the –onefile option to create a single executable file instead of a directory of files.
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pyinstaller –onefile myapp.py
There are many other options and customization settings available in pyinstaller. You can refer to the documentation for more information.
Once you have packaged your app, you can distribute it to users or deploy it on a server. The app can be run on any system that supports the target platform (e.g. Windows, macOS, Linux).
Top Python Questions 2023 with Answers
Q10. How to run python notebook locally without pycharm
Ans. To run a Python notebook from your local machine without using PyCharm, you will need to install the jupyter package and then use the jupyter-notebook command to launch the Jupyter Notebook server.
Here’s an example of how you can do this:
Install the jupyter package using pip:
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pip install jupyter
Navigate to the directory where your Python notebook is located using the command line or terminal.
Run the jupyter-notebook command:
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jupyter-notebook
This will start the Jupyter Notebook server and open a new tab in your web browser with the Jupyter Notebook dashboard.
In the dashboard, click on the name of your Python notebook to open it.
You can then use the Jupyter Notebook interface to edit and run the cells in your notebook.
You can also use the jupyter-lab command to launch the Jupyter Lab server, which is a more feature-rich interface for working with Jupyter notebooks.
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jupyter-lab
Note that the Jupyter Notebook server must be running in order to use the notebooks. You can stop the server by closing the tab in your web browser or by pressing CTRL+C in the terminal window where it is running.
Top Python Questions 2023 with Answers
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