How to write a dictionary into an existing file?

Question

Let\'s say I have a dictionary and I want to write it into an existing file. How can I do so without losing anything that could potentially already exist in the file? What I

Answer 1

If you want to append a text representation of each key-value pair in the dictionary into a text file you could look into the following approach:

def write_report(r, filename):
    input_file=open(filename, "a")
    for k, v in r.items():
        line = '{}, {}'.format(k, v) 
        print(line, file=input_file)        
    input_file.close()

The above can be expressed more cleanly with the with statment.

def write_report(r, filename):    
    with open(filename, "a") as input_file:
        for k, v in r.items():
            line = '{}, {}'.format(k, v) 
            print(line, file=input_file)