I have a dictionary and am trying to write it to a file.
exDict = {1:1, 2:2, 3:3}
with open('file.txt', 'r') as file:
file.write(exDict)
I then have the error
file.write(exDict)
TypeError: must be str, not dict
So I fixed that error but another error came
exDict = {111:111, 222:222}
with open('file.txt', 'r') as file:
file.write(str(exDict))
The error:
file.write(str(exDict))
io.UnsupportedOperation: not writable
I have no idea what to do as I am still a beginner at python. If anyone knows how to resolve the issue, please provide an answer.
NOTE: I am using python 3, not python 2
First of all you are opening file in read mode and trying to write into it. Consult - IO modes python
Secondly, you can only write a string to a file. If you want to write a dictionary object, you either need to convert it into string or serialize it.
import json
# as requested in comment
exDict = {'exDict': exDict}
with open('file.txt', 'w') as file:
file.write(json.dumps(exDict)) # use `json.loads` to do the reverse
In case of serialization
import cPickle as pickle
with open('file.txt', 'w') as file:
file.write(pickle.dumps(exDict)) # use `pickle.loads` to do the reverse
For python 3.x pickle package import would be different
import _pickle as pickle
fout = "/your/outfile/here.txt"
fo = open(fout, "w")
for k, v in yourDictionary.items():
fo.write(str(k) + ' >>> '+ str(v) + '\n\n')
fo.close()
I do it like this in python 3:
with open('myfile.txt', 'w') as f:
print(mydictionary, file=f)
The probelm with your first code block was that you were opening the file as 'r' even though you wanted to write to it using 'w'
with open('/Users/your/path/foo','w') as data:
data.write(str(dictionary))
If you want a dictionary you can import from a file by name, and also that adds entries that are nicely sorted, and contains strings you want to preserve, you can try this:
data = {'A': 'a', 'B': 'b', }
with open('file.py','w') as file:
file.write("dictionary_name = { \n")
for k in sorted (data.keys()):
file.write("'%s':'%s', \n" % (k, data[k]))
file.write("}")
Then to import:
from file import dictionary_name
I know this is an old question but I also thought to share a solution that doesn't involve json. I don't personally quite like json because it doesn't allow to easily append data. If your starting point is a dictionary, you could first convert it to a dataframe and then append it to your txt file:
import pandas as pd
one_line_dict = exDict = {1:1, 2:2, 3:3}
df = pd.DataFrame.from_dict([one_line_dict])
df.to_csv('file.txt', header=False, index=True, mode='a')
I hope this could help.
import json exDict = {1:1, 2:2, 3:3} file.write(json.dumps(exDict))
https://developer.rhino3d.com/guides/rhinopython/python-xml-json/
import json
with open('tokenler.json', 'w') as file:
file.write(json.dumps(mydict, ensure_ascii=False))
来源:https://stackoverflow.com/questions/36965507/writing-a-dictionary-to-a-text-file