Opening and appending to file in Python3

[jakey]

I am really enjoying myself learning Python3. But now i seem to have hit a brick wall and cannot find a way around it.
I have been practicing the little i know of python3 with a simple little script called "practice.py" as follows:

    #!/usr/bin/env python3
    #
    practice = ["Billy", "John", "Peter", "Simon", "Kevin"]
    print(*practice, sep='\n')

Which returned the following:

Billy
John
Peter
Simon
Kevin

Flushed with success i decided to add another name to the list "a":

    f = open("lpthw/practice.py", "a") 
    When i try to go to the second line i recieve an error of "Invalid syntax"

Could some one help me out here please.

 

[menator01]

This f = open("lpthw/practice.py", "a") doesn't do anything by itself.
I recommend reading about working with files.

File Handling in Python: A Complete Guide • datagy

Python provides you with incredibly versatile and powerful ways in which to handle files. Being a general-purpose programming language, completing I/O operations in Python is quite easy. Being able to work with files with the simple and intuitive syntax of Python makes it easy to work with files...

datagy.io

 

[VBService]

I suggest using With Open in Python – With Statement.

 

[jakey]

I have now got around the error and can't wait to learn all i can regarding the Python programming Language.
I have to agree with VBService that using With Open is a better option. Big thanks for the replies.

 

[alexcray]

I am really enjoying myself learning Python3. But now i seem to have hit a brick wall and cannot find a way around it.
I have been practicing the little i know of python3 with a simple little script called "practice.py" as follows:

    #!/usr/bin/env python3
    #
    practice = ["Billy", "John", "Peter", "Simon", "Kevin"]
    print(*practice, sep='\n')

Which returned the following:

Billy
John
Peter
Simon
Kevin

Flushed with success i decided to add another name to the list "a":

    f = open("lpthw/practice.py", "a")
    When i try to go to the second line i recieve an error of "Invalid syntax"

Could some one help me out here please.

• open("myfile.txt", "a") opens the file "myfile.txt" in append mode.
• The with statement ensures the file is automatically closed after the indented block finishes, even in case of errors.
• file.write("This text will be appended to the file.\n") writes the string to the file, followed by a newline character (\n).

 

[menator01]

Here is a quick example working with a list and a text file

# Working with list
print('working with list')
practice = ["Billy", "John", "Peter", "Simon", "Kevin"]
print(*practice, sep='\n')
# Add name to list
practice.append('Kelly')
print()
print('updated list')
print(*practice, sep='\n')

print()
print('working with files')
# Working with files
txt_file = 'practice.txt'
print('reading file')
with open(txt_file, 'r') as tfile:
    data = tfile.readlines()
    print(*data, sep='')
print('writing to files')
with open(txt_file, 'a') as tfile:
    tfile.write('Jude\n')
print('reading updated file')
with open(txt_file, 'r') as tfile:
    print(*tfile.readlines(), sep='')

Output

working with list
Billy
John
Peter
Simon
Kevin

updated list
Billy
John
Peter
Simon
Kevin
Kelly

working with files
reading file
Billy
John
Peter
Simon
Kevin

writing to files
reading updated file
Billy
John
Peter
Simon
Kevin
Jude

 

[alexcray]

I am really enjoying myself learning Python3. But now i seem to have hit a brick wall and cannot find a way around it.
I have been practicing the little i know of python3 with a simple little script called "practice.py" as follows: