Write To and Read Files with Python (Python Part 9)

00:00 Intro
02:18 Permissions
05:51 Write to File
10:22 Write HTML to File
15:41 ACII Formatting Text
18:35 Read File Into Variable Value
22:54 File Modes
33:34 Change File Path
41:29 Change Current Working Directory
43:59 Create an HTML Report from CSV Example
59:10 Final Thoughts

File Modes:

w – overwrite
a – append to end
a+ – create file if does not exist
r – read
r+ – create file if does not exist
rb – read in bytes (multimedia file)
wb – write in bytes (multimedia files)

write.py

file = open('test.txt', 'w')
file.write('hello from FIRST example')
file.close()

with open('test2.txt','w') as file2:
  file2.write('hello from the SECOND example')

web.py

message = '''<h1>TITLE</h1>
             <p>This is a website</p>
             <p style="color:red;">Isn't it Cool!</p>
            '''

with open('web.html','w') as file2:
  file2.write(message)

text.py

message = 'This\t is\t a way to\t format\n text'

with open('text.txt','w') as file:
  file.write(message)

read.py

file = open('test.txt', 'r')
message = file.read()
file.close()

print(message)

with open('test2.txt', 'r') as file2:
  message2 = file2.read()

print(message2)

file-path.py

import os

file = open('test3.txt', 'w')

file.write('hello from the PATH example')

file.close()

print(os.getcwd())
print(os.path.dirname(os.path.realpath(__file__)))

directory = os.path.dirname(os.path.realpath(__file__))
print(directory)

file_path = os.path.join(directory,'test4.txt')
print(file_path)

file = open(file_path,'w')
file.write('hello from NEW FILE PATH')
file.close()

path-cwd.py

import os

print(os.getcwd())

new_directory = '/'

os.chdir(new_directory)

print(os.getcwd())

example.py

with open('data.txt', 'r') as file:
    record = file.read()

print(record)

record = record.split('\n')

print(record)

with open('report.html', 'w') as report:
    report.write('<table>')
    for student in record:
        if 'large' in student:
            value = student.split(',')
            result = '<tr>'
            for item in value:
                result += f'<td>{item}</td>'
            report.write(f'{result}</tr>')
    report.write('</table>')

data.txt

bob, 12, large, boy
sue, 33, small, girl
fred, 47, medium, boy
paul, 22, large, boy
tim, 21, small, boy
patty, 20, medium, girl
sally, 15, large, girl