将值附加到 for 循环中的字典，python

Question

I am a bit lousy with dictionary elements and have a query on appending key,value pairs in dict in a loop. dict.update() overwrites the last value in the dict.

Sample input:

names object is the sample input with name and text will come from different object

names = [    'name23.pdf','thisisnew.docx','journey times.docx','Sheet 2018_19.pdf', 'Essay.pdf' ] 

Expected Output:

{'name': 'name23.pdf', 'text': 'text1'}
{'name': 'thisisnew.docx', 'text': 'To be filled'}
{'name': 'journey times.docx', 'text': 'To be filled'}
{'name': 'Sheet 2018_19.pdf', 'text': 'To be filled'}
{'name': 'Essay.pdf', 'text': 'To be filled'}


final_dict = {}
for name in names:
    name = {'name': name,'text' : 'To be filled'}
    final_dict.update(name)
    print(final_dict)

Answer 1

Is this what you want?

names = ['name23.pdf', 'thisisnew.docx', 'journey times.docx', 'Sheet 2018_19.pdf', 'Essay.pdf']
print([{"name": n, "text": "To be filled"} for n in names])

Output:

[{'name': 'name23.pdf', 'text': 'To be filled'}, {'name': 'thisisnew.docx', 'text': 'To be filled'}, {'name': 'journey times.docx', 'text': 'To be filled'}, {'name': 'Sheet 2018_19.pdf', 'text': 'To be filled'}, {'name': 'Essay.pdf', 'text': 'To be filled'}]

If you want a for loop then you can do this:

names = ['name23.pdf', 'thisisnew.docx', 'journey times.docx', 'Sheet 2018_19.pdf', 'Essay.pdf']

output = []
for name in names:
    output.append({'name': name, 'text': 'To be filled'})

print(output)

The output is going to be the same as above.

However, using your approach will produce only one dictionary with the value of name matching the last element from the list. Why? Because keys in a dictionary have to be unique and each key can have only one value.

names = ['name23.pdf', 'thisisnew.docx', 'journey times.docx', 'Sheet 2018_19.pdf', 'Essay.pdf']

final_dict = {}
for name in names:
    final_dict.update({'name': name, 'text': 'To be filled'})
    print(final_dict)

print(f"Final result: {final_dict}")

Result:

{'name': 'name23.pdf', 'text': 'To be filled'}
{'name': 'thisisnew.docx', 'text': 'To be filled'}
{'name': 'journey times.docx', 'text': 'To be filled'}
{'name': 'Sheet 2018_19.pdf', 'text': 'To be filled'}
{'name': 'Essay.pdf', 'text': 'To be filled'}

Final result: {'name': 'Essay.pdf', 'text': 'To be filled'}