You can use the keyword argument marker to emphasize each point with a specified marker:
Mark each point with a circle:
import matplotlib.pyplot as plt
import numpy as np
ypoints = np.array([3, 8, 1, 10])
plt.plot(ypoints, marker = 'o')
plt.show()
The plot() function is used to draw points (markers) in a diagram.
By default, the plot() function draws a line from point to point.
The function takes parameters for specifying points in the diagram.
Parameter 1 is an array containing the points on the x-axis.
Parameter 2 is an array containing the points on the y-axis.
If we need to plot a line from (1, 3) to (8, 10), we have to pass two arrays [1, 8] and [3, 10] to the plot function. Continue reading Python Matplotlib Plotting
Most of the Matplotlib utilities lies under the pyplot submodule, and are usually imported under the plt alias:
import matplotlib.pyplot as plt
Now the Pyplot package can be referred to as plt. Continue reading Python Matplotlib Pyplot
If you have Python and PIP already installed on a system, then installation of Matplotlib is very easy.
Install it using this command:
C:\Users\Your Name>pip install matplotlib
If this command fails, then use a python distribution that already has Matplotlib installed, like Anaconda, Spyder etc.
Matplotlib is a low level graph plotting library in python that serves as a visualization utility.
Matplotlib was created by John D. Hunter.
Matplotlib is open source and we can use it freely.
Matplotlib is mostly written in python, a few segments are written in C, Objective-C and Javascript for Platform compatibility.
To delete a file, you must import the OS module, and run its os.remove() function:
Remove the file “demofile.txt”:
import os
os.remove("demofile.txt")
To avoid getting an error, you might want to check if the file exists before you try to delete it : Continue reading Python Delete File
To write to an existing file, you must add a parameter to the open() function:
"a" – Append – will append to the end of the file
"w" – Write – will overwrite any existing content
Open the file “demofile2.txt” and append content to the file:
f = open("demofile2.txt", "a")
f.write("Now the file has more content!")
f.close()
#open and read the file after the appending:
f = open("demofile2.txt", "r")
print(f.read())
File handling is an important part of any web application.
Python has several functions for creating, reading, updating, and deleting files.
The key function for working with files in Python is the open() function.
The open() function takes two parameters; filename, and mode.
There are four different methods (modes) for opening a file:
"r" – Read – Default value. Opens a file for reading, error if the file does not exist
"a" – Append – Opens a file for appending, creates the file if it does not exist
"w" – Write – Opens a file for writing, creates the file if it does not exist
"x" – Create – Creates the specified file, returns an error if the file exists
In addition you can specify if the file should be handled as binary or text mode
"t" – Text – Default value. Text mode
"b" – Binary – Binary mode (e.g. images)
F-String was introduced in Python 3.6, and is now the preferred way of formatting strings.
Before Python 3.6 we had to use the format() method.
F-string allows you to format selected parts of a string.
To specify a string as an f-string, simply put an f in front of the string literal, like this:
Create an f-string:
txt = f"The price is 49 dollars"
print(txt)
Python allows for user input.
That means we are able to ask the user for input.
The method is a bit different in Python 3.6 than Python 2.7.
Python 3.6 uses the input() method.
Python 2.7 uses the raw_input() method. Continue reading Python User Input