Python for Data Analysts

Python for Data Analysis: Roadmap

10 Pandas (python) functions
I used the most as a Data Analyst👇

1/ read_csv(): Reads data from a CSV file.
2/ head(): Displays the first few rows of a df.
3/ info(): Provides metadata about the df.
4/ describe(): Offers statistics.
5/ groupby(): Groups data.
6/ merge(): Combines dfs using a common column.
7/ drop_duplicates(): Removes duplicate rows.
8/ isna(): Checks for missing values.
9/ drop(): Removes specified rows or columns.
10/ apply(): Applies a custom function to df.

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Frequently asked Python practice questions and answers in Data Analyst Interview:
1.Temperature Conversion: Write a program that converts a given temperature from Celsius to Fahrenheit or from Fahrenheit to Celsius based on user input.
temp = float(input('Enter the temperature: '))
unit = input('Enter the unit (C/F): ').upper()
if unit == 'C':
converted = (temp * 9/5) + 32
print(f'Temperature in Fahrenheit: {converted}')
elif unit == 'F':
converted = (temp - 32) * 5/9
print(f'Temperature in Celsius: {converted}')
else:
print('Invalid unit')

2.Multiplication Table: Write a program that prints the multiplication table of a given number using a while loop.
num = int(input('Enter a number: '))
i = 1
while i <= 10:
print(f'{num} x {i} = {num * i}')
i += 1

3.Greatest of Three Numbers: Write a program that takes three numbers as input and prints the greatest of the three.
num1 = float(input('Enter first number: '))
num2 = float(input('Enter second number: '))
num3 = float(input('Enter third number: '))
if num1 >= num2 and num1 >= num3:
print(f'The greatest number is {num1}')
elif num2 >= num1 and num2 >= num3:
print(f'The greatest number is {num2}')
else:
print(f'The greatest number is {num3}')

4.Sum of Even Numbers: Write a program that calculates the sum of all even numbers between 1 and a given number using a while loop.
num = int(input('Enter a number: '))
total = 0
i = 2
while i <= num:
total += i
i += 2
print(f'The sum of even numbers up to {num} is {total}')

5.Check Armstrong Number: Write a program that checks if a given number is an Armstrong number.
num = int(input('Enter a number: '))
sum_of_digits = 0
original_num = num
while num > 0:
digit = num % 10
sum_of_digits += digit ** 3
num //= 10
if sum_of_digits == original_num:
print(f'{original_num} is an Armstrong number')
else:
print(f'{original_num} is not an Armstrong number')

6.Reverse a Number: Write a program that reverses the digits of a given number using a while loop.
num = int(input('Enter a number: '))
reversed_num = 0
while num > 0:
digit = num % 10
reversed_num = reversed_num * 10 + digit
num //= 10
print(f'The reversed number is {reversed_num}')

7.Count Vowels and Consonants: Write a program that counts the number of vowels and consonants in a given string.
string = input('Enter a string: ').lower()
vowels = 'aeiou'
vowel_count = 0
consonant_count = 0
for char in string:
if char.isalpha():
if char in vowels:
vowel_count += 1
else:
consonant_count += 1
print(f'Number of vowels: {vowel_count}')
print(f'Number of consonants: {consonant_count}')

Python Interview Q&A: https://topmate.io/coding/898340

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COMMON TERMINOLOGIES IN PYTHON - PART 1

Have you ever gotten into a discussion with a programmer before? Did you find some of the Terminologies mentioned strange or you didn't fully understand them?

In this series, we would be looking at the common Terminologies in python.

It is important to know these Terminologies to be able to professionally/properly explain your codes to people and/or to be able to understand what people say in an instant when these codes are mentioned. Below are a few:

IDLE (Integrated Development and Learning Environment) - this is an environment that allows you to easily write Python code. IDLE can be used to execute a single statements and create, modify, and execute Python scripts.

Python Shell - This is the interactive environment that allows you to type in python code and execute them immediately

System Python - This is the version of python that comes with your operating system

Prompt - usually represented by the symbol ">>>" and it simply means that python is waiting for you to give it some instructions

REPL (Read-Evaluate-Print-Loop) - this refers to the sequence of events in your interactive window in form of a loop (python reads the code inputted>the code is evaluated>output is printed)

Argument - this is a value that is passed to a function when called eg print("Hello World")... "Hello World" is the argument that is being passed.

Function - this is a code that takes some input, known as arguments, processes that input and produces an output called a return value. E.g print("Hello World")... print is the function

Return Value - this is the value that a function returns to the calling script or function when it completes its task (in other words, Output). E.g.
>>> print("Hello World")
Hello World
Where Hello World is your return value.

Note: A return value can be any of these variable types: handle, integer, object, or string

Script - This is a file where you store your python code in a text file and execute all of the code with a single command

Script files - this is a file containing a group of python scripts

How to be a Prompt Engineer 101

The shortest and most comprehensive guide

1. start with an explanation

Make a description and character situation at the beginning of the Prompt

Error example:

Please help me read the following code:

{your input here}

Correct example:

Now let's play the role, you are a senior information security engineer, I will give you a piece of code, please help me read the code and point out where there may be security vulnerable.



Text: """

{your input here}

"""

2. Prompt to describe the situation

In the prompt, it is necessary to describe the context, result, length, format and style as much as possible

Error example:

Write a short story for kids

Correct example:

Write a funny soccer story for kids that teaches the kid that persistence is the key for success in the style of Rowling.

3. gives output in the format

If you are doing data analysis, please give the input template of the format

Error example:

Extract house pricing data from the following text.

Text: """

{your text containing pricing data}

"""

Correct example:

Extract house pricing data from the following text.

Desired format: """

House 1 | $1,000,000 | 100 sqm

House 2 | $500,000 | 90 sqm

... (and so on)

"""

Text: """

{your text containing pricing data}

"""

4. Add some example questions and answers

Sometimes adding some question and answer examples can make GPT more intelligent

Correct example:

Extract brand names from the texts below.

Text 1: Finxter and YouTube are tech companies. Google is too.

Brand names 2: Finxter, YouTube, Google

###

Text 2: If you like tech, you'll love Finxter!

Brand names 2: Finxter

###

Text 3: {your text here}

Brand names 3:

The question and answer example is also a standard template example in fine-tune


5. Simplify the sentence and clarify the purpose


Keep your words as short as possible and don't say useless content


Error example:

ChatGPT, write a sales page for my company selling sand in the desert, please write only a few sentences, nothing long and complex

Correct example:

Write a 5-sentence sales page, sell sand in the desert.

6. Good at using introductory words

Error example:

Write a Python function that plots my net worth over 10 years for different inputs on the initial investment and a given ROI

Correct example:

# Python function that plots net worth over 10

# years for different inputs on the initial

# investment and a given ROI


import matplotlib


def plot_net_worth(initial, roi):

👉 List comprehensions: List comprehension offers a shorter syntax when you want to create a new list based on the values of an existing list.

Example:
Based on a list of fruits, you want a new list, containing only the fruits with the letter "a" in the name.
Without list comprehension you will have to write a for statement with a conditional test inside:

fruits = ["apple", "banana", "cherry", "kiwi", "mango"]
newlist = []

for x in fruits:
  if "a" in x:
    newlist.append(x)

print(newlist)

With list comprehension you can do all that with only one line of code:

fruits = ["apple", "banana", "cherry", "kiwi", "mango"]

newlist = [x for x in fruits if "a" in x]

print(newlist)

Frequently asked Python practice questions and answers in Data Analyst Interview:
1.Temperature Conversion: Write a program that converts a given temperature from Celsius to Fahrenheit or from Fahrenheit to Celsius based on user input.
temp = float(input('Enter the temperature: '))
unit = input('Enter the unit (C/F): ').upper()
if unit == 'C':
converted = (temp * 9/5) + 32
print(f'Temperature in Fahrenheit: {converted}')
elif unit == 'F':
converted = (temp - 32) * 5/9
print(f'Temperature in Celsius: {converted}')
else:
print('Invalid unit')

2.Multiplication Table: Write a program that prints the multiplication table of a given number using a while loop.
num = int(input('Enter a number: '))
i = 1
while i <= 10:
print(f'{num} x {i} = {num * i}')
i += 1

3.Greatest of Three Numbers: Write a program that takes three numbers as input and prints the greatest of the three.
num1 = float(input('Enter first number: '))
num2 = float(input('Enter second number: '))
num3 = float(input('Enter third number: '))
if num1 >= num2 and num1 >= num3:
print(f'The greatest number is {num1}')
elif num2 >= num1 and num2 >= num3:
print(f'The greatest number is {num2}')
else:
print(f'The greatest number is {num3}')

4.Sum of Even Numbers: Write a program that calculates the sum of all even numbers between 1 and a given number using a while loop.
num = int(input('Enter a number: '))
total = 0
i = 2
while i <= num:
total += i
i += 2
print(f'The sum of even numbers up to {num} is {total}')

5.Check Armstrong Number: Write a program that checks if a given number is an Armstrong number.
num = int(input('Enter a number: '))
sum_of_digits = 0
original_num = num
while num > 0:
digit = num % 10
sum_of_digits += digit ** 3
num //= 10
if sum_of_digits == original_num:
print(f'{original_num} is an Armstrong number')
else:
print(f'{original_num} is not an Armstrong number')

6.Reverse a Number: Write a program that reverses the digits of a given number using a while loop.
num = int(input('Enter a number: '))
reversed_num = 0
while num > 0:
digit = num % 10
reversed_num = reversed_num * 10 + digit
num //= 10
print(f'The reversed number is {reversed_num}')

7.Count Vowels and Consonants: Write a program that counts the number of vowels and consonants in a given string.
string = input('Enter a string: ').lower()
vowels = 'aeiou'
vowel_count = 0
consonant_count = 0
for char in string:
if char.isalpha():
if char in vowels:
vowel_count += 1
else:
consonant_count += 1
print(f'Number of vowels: {vowel_count}')
print(f'Number of consonants: {consonant_count}')

Python Interview Q&A: https://topmate.io/coding/898340

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ENJOY LEARNING 👍👍

Data Cleaning Techniques in Python ✅