Python for Machine Learning

Machine Learning
#13

Programming languages deal with data. So, the question which arises over here is how do we actually store this data if we want to reuse it? Let’s you’re working with some data about employees of your organization and you’d have to store the names of employees, so how will you do that?

Well this is where variables come in. Variables are temporary storage spaces to store values.
Let’s say we create a variable called “employee_name”. Then we can go ahead and store the value “John” inside the variable. After some time, i can replace the value with “Sam”. Again after some time i’ll replace it with “Matt”.

Let’s see how can we create variables in python:
var1 = “Sam”
var1 = “Matt”
var1 = “John”
Since, variable is a temporary storage space, we can change the values which are stored in the variable “var1”.

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#14

What are the basic math operators in Python?

1 Like
#15

What are strings in Python?

1 Like
#16

What is the best compiler for Python?

#17

What does n do in Python?

#18

What is the latest Python version?

#19

Operators in Python as the name states help us to perform different types of operations on the data.

Arithmetic Operators:
Arithmetic operators help us to perform simple arithmetic operations such as addition, subtraction, multiplication and division.
a=10
b=20
a+b
a-b
a/b
a*b

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#20

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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#21

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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#22

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.

#23

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.

2 Likes
#24

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

#25

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
#26

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

#27

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.!

xx
xx1841×906 57.3 KB

1 Like
#28

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.

#29

Can anybody help me with knn?

1 Like
#30

How to use not equal operator in python?

#31

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

#32

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”)