Python Libraries

Transfer Bridge 2020

csv

Reading CSV files (Array)

import csv

with open('data.csv') as csvfile: #open csv file

# create reader object to read in the file

readCSV = csv.reader(csvfile)

# print a line out for each row

for row in readCSV:

print(row)

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data.csv

Output:

['Name', 'Age', 'StudentID']

['Blobby', '21', '012345678']

['Jimin', '22', '010101010']

['Pranav', '20', '101010101']

['Sofia', '21', '876543210']

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Reading CSV files (Dict)

import csv

with open('data.csv') as csvfile: #open csv file

# create Dictreader object to read in file

readCSV = csv.DictReader(csvfile)

# print a line out for each row

for row in readCSV:

print(row)

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Output:

{'Name': 'Blobby', 'Age': '21', 'StudentID': '012345678'}

{'Name': 'Jimin', 'Age': '22', 'StudentID': '010101010'}

{'Name': 'Pranav', 'Age': '20', 'StudentID': '101010101'}

{'Name': 'Sofia', 'Age': '21', 'StudentID': '876543210'}

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data.csv

tkinter

What is tkinter?

• tkinter (Tk interface) is the standard Python interface to Tk GUI toolkit
• Used to develop desktop application
• GUI (Graphic User Interface) ~ an interface that allows users to interact with electronic devices using graphical icons
• more visual than command line

GUI

Initialize a Window

import tkinter as tk

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def main():

# Create Tkinter window

window = tk.Tk()

window.title(‘Demo’)

“”” add widgets here “””

window.mainloop() # keep looping infinitely until there's a new event or the window is closed

main()

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Widget Organization

• Methods for organizing widgets in the parent window
• pack() method
• organizes the widgets in blocks before placing in the parent widget.
• https://www.geeksforgeeks.org/python-pack-method-in-tkinter/?ref=lbp
• grid() method
• organizes the widgets in grid (table-like structure) before placing in the parent widget.
• https://www.geeksforgeeks.org/python-grid-method-in-tkinter/?ref=lbp
• place() method
• organizes the widgets by placing them on specific positions directed by the programmer
• https://www.geeksforgeeks.org/python-place-method-in-tkinter/?ref=lbp

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https://redhuli.io/python/pack-place-and-grid-in-tkinter/

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Button

Widget Functions

• activebackground: to set the background color when button is under the cursor.
• activeforeground: to set the foreground color when button is under the cursor.
• bg: to set he normal background color.
• command: to call a function.
• font: to set the font on the button label.
• image: to set the image on the button.
• width: to set the width of the button.
• height: to set the height of the button.

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Button Example

import tkinter as tk

WINDOW_WIDTH = 500

WINDOW_HEIGHT = 600

def main():

window = tk.Tk()

button = tk.Button(window, text='Press', height=WINDOW_HEIGHT, width=35, command=window.destroy)

button.pack(side=‘top’) #pack to the top of the screen

window.mainloop()

main()

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Canvas

• canvas widget used for drawing, or other layouts such as graphics and text
• Canvas Functions:
• bd: to set the border width in pixels.
• bg: to set the normal background color.
• cursor: to set the cursor used in the canvas.
• highlightcolor: to set the color shown in the focus highlight.
• width: to set the width of the widget.
• height: to set the height of the widget.

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Canvas Example

import tkinter as tk

WINDOW_WIDTH = 500

WINDOW_HEIGHT = 600

def main():

# Create Tkinter window

window = tk.Tk()

my_canvas = tk.Canvas(window, width=WINDOW_WIDTH, height=WINDOW_HEIGHT, bg='yellow')

my_canvas.pack() # make width and height adjustment works on the canvas

window.mainloop() # keep looping until there's a new event

main()

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Draw Lines and Shapes on Canvas

Canvas Coordinate System

(x0, y0)

(x1, y1)

(x0, y0)

(x1, y1)

Drawing Example

import tkinter as tk

WINDOW_WIDTH = 500

WINDOW_HEIGHT = 600

def main():

window = tk.Tk()

my_canvas = tk.Canvas(window, width=WINDOW_WIDTH, height=WINDOW_HEIGHT, bg='yellow')

my_canvas.pack()

my_canvas.create_line(40, 50, 300, 100, 10, 150, fill='blue') #can use more than 2 points...

my_canvas.create_oval(30, 30, 50, 50, fill='purple')

my_canvas.create_rectangle(300, 75, 350, 125, fill='red')

window.mainloop() # keep looping until there's a new event

main()

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References

https://www.geeksforgeeks.org/reading-csv-files-in-python/

https://docs.python.org/3/library/csv.html

https://www.geeksforgeeks.org/python-gui-tkinter/ **short ver. tkinter tutorial**

https://www.geeksforgeeks.org/introduction-to-tkinter/?ref=lbp **full tutorial**

https://docs.python.org/3/library/tkinter.html

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