Python for Machine Learning

Compilers are programs that convert source code written in a high-level programming language to a lower-level programming language.

Here are the top 5 best compilers for Python:

• CPython: This compiler-cum-interpreter is the de-facto Python compiler as it belongs to the reference implementation of Python i.e. CPython

• Brython: Supports – Python 3 to 3.7

• Nuitka: Supports – Python 2.6, 2.7, 3.3 to 3.7

• PyJS: Supports – Up to Python 2.7

• Skulpt: Supports – Up to Python 3.3

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In Python strings, the backslash “” is a special character, also called the “escape” character. It is used in representing certain white space characters and “\n” is one of them. It is used to start a new line.

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Strings are sequence of characters enclosed within single quotes(‘ ’), double quotes(“ “) or triple quotes(‘’’ ‘’’) a = ‘Hello World’
b = “This is Sparta”
c = ‘’‘I am
going
to France
tomorrow
‘’’

Code Explanation:
Here we start off by creating a string variable called ‘my_string’ and assign the value “My name is John” to it. In a string, each individual character is at a particular index and the index value starts at 0.
So, if we have to extract the first character in the string ‘M’, then, we ‘d have to give this command:
my_string[0]
Since, indexing starts at 0, the index value of the first character ‘M’ will be 0.
We would have to give this command:
my_string[-1] to extract the last character from this string.

As of now, the latest version of python currently running is 3.8.3. From now on if you want to the know the latest version of Python, go to https://www.python.org/downloads/ and you’ll see the most latest version available for download.

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How can I read a pkl file for visualising it using pandas?

Pickle files (.pkl) are used to store the serialized form of Python objects. This means objects like list, set, tuple, dict, etc. are converted to a character stream before being stored on the disk. This allows you to continue working with the objects later on. These are particularly useful when you have trained your machine learning model and want to save them to make predictions later on.

So, if you serialized the files before saving them, you need to de-serialize them before you use them in your Python programs. This is done using the pickle.load() function in the pickle module. But when you open the pickle file with Python’s open() function, you need to provide the ‘rb’ parameter to read the binary file.

import pickle

with open('./Importing files/sample_pickle.pkl','rb') as file:
    data = pickle.load(file)

# pickle data
print(type(data))

df_pkl = pd.DataFrame(data)
df_pkl

Sir,
Can I use pd.read_pkl?
I have used pickle.load but not the aforementioned one. I tried to use it but got error message. It would be great if you could help me.
Thanking you,
Yours respectfully,
Indraayudh Talukdar

I just completed all the course material for Python for Machine Learning but then im not being able to access my qizz, which also donot allow to claim my certificate. Can somebody please help me.!

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Please check if you have watched all the videos completely (till the tick mark comes) in the course or not. The quiz will only unlock once you watches all the videos in the course.

Can anybody help me with knn?

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How to use not equal operator in python?

What do you mean by python scripting? What is a script and a module in python?

Python has two options for not equal operators:

  1. “!=”
  2. “<>”

!=( not equal operator ): This operator returns boolean values like

  • If the values of two operands are not equal, then the condition becomes true…
  • (a != b) is true.

“<>”: If values of two operands are not equal, then the condition becomes true.

  • If values of two operands are not equal, then the condition becomes true.
  • (a != b) is true.

string = ‘apple’
if string == ‘apple’: # equal
print (“matched”)
elif str != ‘apple’: # not equal
print (“not matched”)

A script is basically used to automate certain tasks in a program and a scripting language is a programming language that uses an Interpreter to translate its source code.

The interpreter reads and executes each line of code one at a time,

In the language Python uses an interpreter to translate and run the code. So for that Python called as a scripting language

How to install tensorflow in anaconda?

  1. Download and install Anaconda or the smaller Miniconda.
  2. On Windows open the Start menu and open an Anaconda Command Prompt.
  3. Choose an alias name for your TensorFlow environment, such as “tf”.
  4. conda create -n tf tensorflow
  5. conda activate tf
  6. Or, to install the current release of GPU TensorFlow on Linux or Windows:
  7. conda create -n tf-gpu tensorflow-gpu

how to find files and skip directories in os.listdir?

If you want to filter the directories then:
os.listdir() —> will return the list of all names in a given path.
You can use os.path.isdir() for this:

basic_path = ‘/path/to/directory’
for name in os.listdir(basic_path):
paths = os.path.join(basic_path, name)
if os.path.isdir(paths):
# skip directories
continue
os.walk()–> this function does the same work under the hood and unless you want to recurse down subdirectories

Can you help me with this error: ModuleNotFoundError: No module named ‘cv2’ ?

This error may come if you do not have an opencv installed module in your system.

check the module is available or not.

$ pip list or conda list

If it is not available, then install Opencv

$ pip install opencv-python or conda install opencv-python

But before that, Install numpy module

$ pip install numpy