import csv
with open("in.csv") as csvfile:
reader = csv.DictReader(csvfile,delimiter=" ")
print(list(reader))
[{'first_name': 'Baked', 'last_name': 'Beans'}, {'first_name': 'Lovely', 'last_name': 'Spam'}, {'first_name': 'Wonderful', 'last_name': 'Spam'}]
If the delimiter is not actually a , you need to specify " " or whatever it is.
Just to clear any confusion, the code works fine for python3.6 also, the only difference is that using DictReader gives Orderdicts by default:
In [1]: import csv
...: with open("in.csv") as csvfile:
...: reader = csv.DictReader(csvfile, delimiter=" ")
...: print(list(reader))
...:
[OrderedDict([('first_name', 'Baked'), ('last_name', 'Beans')]), OrderedDict([('first_name', 'Lovely'), ('last_name', 'Spam')]), OrderedDict([('first_name', 'Wonderful'), ('last_name', 'Spam')])]
You can access keys exactly the same, an OrderedDict just keeps key insertion order:
In [2]: import csv
...: with open("in.csv") as csvfile:
...: reader = csv.DictReader(csvfile, delimiter=" ")
...: for dct in reader:
...: print(f"{dct['first_name']} {dct['last_name']}")
...:
...:
Baked Beans
Lovely Spam
Wonderful Spam
Which py3.6 actually does too, so if for some reason you really want a dict:
In [5]: import csv
...: with open("in.csv") as csvfile:
...: reader = csv.DictReader(csvfile, delimiter=" ")
...: for dct in map(dict, reader):
...: print(dct)
...: print(f"{dct['first_name']} {dct['last_name']}")
...:
...:
{'first_name': 'Baked', 'last_name': 'Beans'}
Baked Beans
{'first_name': 'Lovely', 'last_name': 'Spam'}
Lovely Spam
{'first_name': 'Wonderful', 'last_name': 'Spam'}
Wonderful Spam
The ordering retention on insertion in py3.6 is an implementation detail and may change, but if enough of us use it, it may just have to stay :)
Answer from Padraic Cunningham on Stack Overflowimport csv
with open("in.csv") as csvfile:
reader = csv.DictReader(csvfile,delimiter=" ")
print(list(reader))
[{'first_name': 'Baked', 'last_name': 'Beans'}, {'first_name': 'Lovely', 'last_name': 'Spam'}, {'first_name': 'Wonderful', 'last_name': 'Spam'}]
If the delimiter is not actually a , you need to specify " " or whatever it is.
Just to clear any confusion, the code works fine for python3.6 also, the only difference is that using DictReader gives Orderdicts by default:
In [1]: import csv
...: with open("in.csv") as csvfile:
...: reader = csv.DictReader(csvfile, delimiter=" ")
...: print(list(reader))
...:
[OrderedDict([('first_name', 'Baked'), ('last_name', 'Beans')]), OrderedDict([('first_name', 'Lovely'), ('last_name', 'Spam')]), OrderedDict([('first_name', 'Wonderful'), ('last_name', 'Spam')])]
You can access keys exactly the same, an OrderedDict just keeps key insertion order:
In [2]: import csv
...: with open("in.csv") as csvfile:
...: reader = csv.DictReader(csvfile, delimiter=" ")
...: for dct in reader:
...: print(f"{dct['first_name']} {dct['last_name']}")
...:
...:
Baked Beans
Lovely Spam
Wonderful Spam
Which py3.6 actually does too, so if for some reason you really want a dict:
In [5]: import csv
...: with open("in.csv") as csvfile:
...: reader = csv.DictReader(csvfile, delimiter=" ")
...: for dct in map(dict, reader):
...: print(dct)
...: print(f"{dct['first_name']} {dct['last_name']}")
...:
...:
{'first_name': 'Baked', 'last_name': 'Beans'}
Baked Beans
{'first_name': 'Lovely', 'last_name': 'Spam'}
Lovely Spam
{'first_name': 'Wonderful', 'last_name': 'Spam'}
Wonderful Spam
The ordering retention on insertion in py3.6 is an implementation detail and may change, but if enough of us use it, it may just have to stay :)
Use list():
print(list(reader))
Demo:
>>> with open('names.csv') as csvfile:
... reader = csv.DictReader(csvfile, delimiter=" ")
... print(list(reader))
...
[{'first_name': 'Baked', 'last_name': 'Beans'}, {'first_name': 'Lovely', 'last_name': 'Spam'}, {'first_name': 'Wonderful', 'last_name': 'Spam'}]
Loading csv.DictReader() into an actual dict
What does .dictreader() do?
python - Creating a dictionary from a csv file? - Stack Overflow
python - Best way to convert csv data to dictionaries - Stack Overflow
Videos
I have a small issue in Python. I use this code to unload a CSV into a dictionary:
with open(csv) as file:
reader = csv.DictReader(file)
for row in reader:
dict.update(row)But only the last entry in the CSV file gets into the dictionary. Why? According to the documentation, it should enter every single iteration of row into dict.
I believe the syntax you were looking for is as follows:
import csv
with open('coors.csv', mode='r') as infile:
reader = csv.reader(infile)
with open('coors_new.csv', mode='w') as outfile:
writer = csv.writer(outfile)
mydict = {rows[0]:rows[1] for rows in reader}
Alternately, for python <= 2.7.1, you want:
mydict = dict((rows[0],rows[1]) for rows in reader)
Open the file by calling open and then using csv.DictReader.
input_file = csv.DictReader(open("coors.csv"))
You may iterate over the rows of the csv file dict reader object by iterating over input_file.
for row in input_file:
print(row)
OR To access first line only
dictobj = csv.DictReader(open('coors.csv')).next()
UPDATE In python 3+ versions, this code would change a little:
reader = csv.DictReader(open('coors.csv'))
dictobj = next(reader)
import csv
reader = csv.DictReader(open('myfile.csv'))
for row in reader:
# profit !
Use csv.DictReader:
Create an object which operates like a regular reader but maps the information read into a dict whose keys are given by the optional fieldnames parameter. The fieldnames parameter is a
sequencewhose elements are associated with the fields of the input data in order. These elements become the keys of the resulting dictionary. If the fieldnames parameter is omitted, the values in the first row of the csvfile will be used as the fieldnames. If the row read has more fields than the fieldnames sequence, the remaining data is added as a sequence keyed by the value of restkey. If the row read has fewer fields than the fieldnames sequence, the remaining keys take the value of the optional restval parameter. Any other optional or keyword arguments are passed to the underlyingreaderinstance...