I am reading your book on daily basis but I am facing an issue regarding where I can use python send me some ideas

Example 8

Computer the value of a block of stock

shares= 150
price= 3 + 5.0/8.0
value= shares * price
print("value",value)

Example 9

Total value of a portfolio made up of two blocks of stock

portfolio = 0
portfolio += 150 * 2 + 1/4.0
portfolio += 75 * 1 + 7/8.0
print("portfolio", portfolio)

Hi Mam,
I am just reading your book titled Python programming, Its more than spoon feeding for beginner. Before ready your i thought i was toughest language, now its looks like myth. Thanks your effort to write in our native language
Regards,
Shahan

this is my code

f = open("demofile.txt","r")

​print(f.read ())

output

C:\Users\My Name>python demo_file_open.py
Hello! Welcome to demofile.txt
This file is for testing purposes.
Good Luck!

f = open("demofile.txt","r")
print(f.read(50))

output

C:\Users\My Name>python demo_file_open.py
Hello!

f = open("demofile.txt", "r")

print(f.readline())
print(f.readline())

output

C:\Users\My Name>python demo_file_open.py

Hello! Welcome to demofile.txt

f = open("demofile.txt","r" )
for a in f:
print(a)

output

C:\Users\My Name>python demo_file_open.py
Hello! Welcome to demofile.txt
This file is for testing purposes.
Good Luck!

f = open("demofile.txt","r")
print(f.readline())
f.close()

output

C:\Users\My Name>python demo_file_open.py

f = open("demofile2.txt","a")
f.write("Now the file has more content!")
f.close()

f = open("demofile2.txt","r")
print(f.read())

output

Now the file has more contentNow the file has more content!

f = open("demofile3.txt","w")
f.write("i have deleted the content")
f.close()
​
​
f = open("demofile3.txt","r")
print(f.read())

output
i have deleted the content

f = open("demofile.txt","r")
print(f.read(5))

output

C:\Us

Chapter Link: https://github.com/Sana-Rasheed/Scripts_of_Python_Programming_Book/blob/master/Chapter_17th_unittest.py
E
ERROR: C:\Users\Nasir\AppData\Roaming\jupyter\runtime\kernel-510a6c02-c3b3-432f-b96a-42c7be9fc54d (unittest.loader._FailedTest)
AttributeError: module 'main' has no attribute 'C:\Users\Nasir\AppData\Roaming\jupyter\runtime\kernel-510a6c02-c3b3-432f-b96a-42c7be9fc54d'

Ran 1 test in 0.001s
FAILED (errors=1)
An exception has occurred, use %tb to see the full traceback.
SystemExit: True