Gain insights into using Python for scientific and engineering applications. Delve into real-world scenarios, learning NumPy, Matplotlib, audio processing, and more through practical, hands-on projects.

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jupter.tar.gz

notebook

obesity_plot_gender

print_gender_pandas

create_sine_wave

notebook_exercise

range

print_gender_pandas_remove_NaN

print_gender_year

print_data_age

print_data_age_with_year

print_data_age_remove_NaN

obesity_plot_age_simple

obesity_plot_age_clear

print_data_age_under_16

print_data_age_25_34

obesity_plot_children_vs_adults

print_movie_top_rated

print_movies_oldie_teen

print_movies_by_gender

print_movies_for_women

print_movies_by_gender_loc

print_movies_diff_gender

movies_diff_gender_plot

print_u_data

print_movies_oldie_index

print_movies_oldies

print_movies_teens

display_image_nouse

grey_image

blur_image

edge_detection_low

edge_detection_high

plot_sin_wave

create_wave_file

display_again

print_frequencies

count_objects

detect_faces

detect_faces_little_mix

count_exact_lines

webcam_detection

single_thread

find_correlation

webcam_face_detection

motion_detection

motion_detection_live

In this course, you will learn to use Python for real-world scientific/engineering applications. For each topic, there will be a real case scenario where you will build a quick solution in Python to solve the problem.

More specifically, you will cover topics such as creating a word counter, NumPy and Matplotlib, audio processing, and a lot more. Throughout each chapter, you will get hands-on experience in building solutions for complex problems that engineers and scientists face every day.

The Practical Guide to Python for Scientists and Engineers

# What are functions in Python?

A **function** is a piece of code that only runs when it is called. Python functions return a value using a return statement if one is specified. A function can be called anywhere after it has been declared.

By itself, a function does nothing. However, when we need to use a function, we can call it, and the code within the function will be executed.

The way to write a function in Python is:
```
def foo(<input>):
    <do something>
    return <value>

```

The `def` input defines a function. Notice the colon (`:`) and the white space? Like loops and if conditions, we need to use indentation for code under the `for` loop.

Let’s get started with functions! We’re going to write the code for counting words from a file as a function.

This is how we wrote it before:
```
words = data.split(" ")
print("The words in the text are:")
print(words)
num_words = len(words)
```

In the code widget below, look at lines 1-4. This is how we are going to write code in a function.

It takes in the list data and returns the number of words. Keep in mind that this is the exact same code as before. The only difference is that it’s now contained in a function.

If you don't understand what line 14 below is doing, don't worry, we'll go over it in the next section.



Functions in Python

Introduction

Create a Word Counter in Python

An Introduction to NumPy and Matplotlib

Python pandas

Audio Processing

Image and Video Processing

MultiThreading vs. Multiprocessing in Python

Machine Learning with an Amazon-like Recommendation Engine

Conclusion

Functions in Python

What are functions in Python?