Learn Python in Malayalam|Chapter 12|File handling in Python | Read & write a file

This is the 12th video on Learn python in Malayalam. This video clearly explains below topics,

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Topics covered in this video

Chapter 11 Assignment discussion -  00:48

File handling in python - 03:48

Generate file data - 04:38  

Save the data in a variable - 05:41

write data to a csv file - 06:18

read from the csv file - 08:46

plotting the data from the scv file - 09:52

standard deviation & mean of data - 11:09

location of the saved file - 11:57

Program used 

#importing libraries

import numpy as np

import pandas as pd

import matplotlib.pyplot as plt

# Get x values of the wave

t = np.linspace(0,1,100)

# calculating the amplitude

y = np.sin(2*np.pi*t) # calculating sine wave

dat = [t,y]

# writing the value in to data.csv

df = pd.DataFrame(data=dat,index=["Time","Amplitude"]).T

# df

df.to_csv('data.csv')

#Reading the file data.csv

df1=pd.read_csv('data.csv',index_col=0)

# df1

#Plotting the function from read value

df1.plot(x="Time",y="Amplitude")

plt.show()

 

# Creating histogram 

df1.hist(column="Amplitude")

# Show plot 

plt.show() 

# Standard deviation of the value

print("Standard Deviation")

print(df1.std(0))

# Mean of the values

print("Mean")

print(df1.mean(0))

Assignment Solution

from numpy import *

from matplotlib.pyplot import *

# Get x values of the sine wave

t = arange(0, 10, 0.01);

# calculating the amplitude

y1 = cos(t)

y2 = cos(5*t)

y = y1*y2+y2

# plotting cos signals in subplot

rcParams["figure.figsize"] = (10,10) # changing the figure size 

fig, axs = subplots(3)

axs[0].plot(t,y1) 

axs[0].set_title("cos(t) signal ")

axs[1].plot(t,y2)

axs[1].set_title("cos(5*t) Signal")

axs[2].plot(t,y)  

axs[2].set_title("cos(t)*cos(5*t)+cos(5*t)")

show() # showing the figure

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Learn Python in Malayalam Playlist: 

https://www.youtube.com/playlist?list=PLmKq-kgKY8uZya3cwcX6otT61NPHXbTK0

Chapter 1 -  https://youtu.be/WiyQ8wTsRO0

Introduction to programming

Introduction to Python

Introduction to Google Co-lab

How to setup Google Co-lab

Chapter 2 -  https://youtu.be/YFngtW42Mls

Python Identifiers

Lines and Indentation

Multi-Line Statements

Chapter 3 - https://youtu.be/gxalG8Aps0A

Quotation in python

Comments in python

Assigning values to variable

Chapter 4 - https://youtu.be/AaEL_f2RHIk

Data types

Numbers

Strings

Chapter 5 - https://youtu.be/irND35-6BZ0

Data types

Lists

Tuple

Dictionary

Chapter 6 - https://youtu.be/MRfg2QZBHvE

Decision making

if condition

if .. else condition

Nested if

Chapter 7 - https://youtu.be/VYXndepcTCM

Loops in Python

while loop

for loop

nested loop

Chapter 8 - https://youtu.be/d7Y2D9H4u7c

Functions in python

arguments in function

Multiple arguments in function

Arbitrary arguments in function

Return value in function

Chapter 9 - https://youtu.be/hFOTKyYCkdw 

Classes in python

Defining a class

Creating an object

Constructors in python

Chapter 10 - https://youtu.be/w-_x2vfpJk0

Matrix in python

Defining matrix in python

Matrix addition

Matrix multiplication

Transpose of a matrix

Inverse of matrix

Rank & eigen values of matrix

Chapter 11 - https://youtu.be/-7DB7OEenms

Plotting in Python

  Line Plot

  Stem Plot

  Bar Plot

  Scatter Plot

  Box Plot

  Histogram

  Multiple Plot, Subplot, plot within plot

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Reff : https://www.tutorialspoint.com/python/python_variable_types.htm 

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