问题
The official way,
r = praw.Reddit('Comment Scraper 1.0 by u/_Daimon_ see '
'https://praw.readthedocs.org/en/latest/'
'pages/comment_parsing.html')
submission = r.get_submission(submission_id='11v36o')
submission.replace_more_comments(limit=None, threshold=0)
is extremely slow. Is there a way to speed this up? There are people that have extracted every reddit comment into a database, so there must be some way to do this quicker.
回答1:
Edit: the new praw api (6.0.0) has lists() which make the job easier:
This also handles AttributeError that might occure due to more_comments through the use of replace_more(limit=None)
submissionList = []
submission.comments.replace_more(limit=None)
for comment in submission.comments.list():
submissionList.append(comment)
Edit: The new praw api (5.0.1) is magical and makes this much easier. Here is how to do it now:
def getSubComments(comment, allComments, verbose=True):
allComments.append(comment)
if not hasattr(comment, "replies"):
replies = comment.comments()
if verbose: print("fetching (" + str(len(allComments)) + " comments fetched total)")
else:
replies = comment.replies
for child in replies:
getSubComments(child, allComments, verbose=verbose)
def getAll(r, submissionId, verbose=True):
submission = r.submission(submissionId)
comments = submission.comments
commentsList = []
for comment in comments:
getSubComments(comment, commentsList, verbose=verbose)
return commentsList
Example usage:
res = getAll(r, "6rjwo1")
#res = getAll(r, "6rjwo1", verbose=False) # This won't print out progress if you want it to be silent. Default is verbose=True
Where r is
username = 'myusernamehere'
userAgent = "MyAppName/0.1 by " + username
clientId = 'myClientId'
clientSecret = "myClientSecret"
password = "passwordformyusernamehere"
r = praw.Reddit(user_agent=userAgent, client_id=clientId, client_secret=clientSecret)
Previous stuff (outdated now):
Okay, I wrote code that can reliably pull every comment from a thread, and takes about 10 seconds for 500 comments, and about a minute for 4000 comments. I named this redApi.py Here it is:
import time
import requests
import requests.auth
import praw
username = 'myusernamehere'
userAgent = "MyAppName/0.1 by " + username
clientId = 'myClientId'
clientSecret = "myClientSecret"
password = "passwordformyusernamehere"
def getPraw():
return praw.Reddit(user_agent=userAgent, client_id=clientId, client_secret=clientSecret)
global accessToken
accessToken = None
def getAccessToken():
client_auth = requests.auth.HTTPBasicAuth(clientId, clientSecret)
post_data = {"grant_type": "password", "username": username, "password": password}
headers = {"User-Agent": userAgent}
response = requests.post("https://www.reddit.com/api/v1/access_token", auth=client_auth, data=post_data, headers=headers)
return response.json()
def makeRequest(apiUrl, useGet=True):
global accessToken
if accessToken is None:
accessToken = getAccessToken()
headers = {"Authorization": "bearer " + accessToken['access_token'], "User-Agent": userAgent}
if useGet:
response = requests.get(apiUrl, headers=headers)
else:
response = requests.post(apiUrl, headers=headers)
time.sleep(1.1)
responseJson = response.json()
if 'error' in responseJson:
if responseJson['error'] == 401:
print "Refreshing access token"
time.sleep(1.1)
accessToken = getAccessToken()
headers = {"Authorization": "bearer " + accessToken['access_token'], "User-Agent": userAgent}
time.sleep(1.1)
response = requests.get(apiUrl, headers=headers)
responseJson = response.json()
return responseJson
global prawReddit
prawReddit = praw.Reddit(user_agent=userAgent, client_id=clientId, client_secret=clientSecret)
# Gets any number of posts
def getPosts(subredditName, numPosts=1000):
global prawReddit
subreddit = prawReddit.get_subreddit(subredditName)
postGetter = praw.helpers.submissions_between(prawReddit, subreddit)
postArray = []
numGotten = 0
while numGotten < numPosts:
postArray.append(postGetter.next())
numGotten += 1
return postArray
# Get all comments from a post
# Submission is a praw submission, obtained via:
# r = redApi.getPraw()
# submission = r.get_submission(submission_id='2zysz7') # (or some other submission id, found via https://www.reddit.com/r/test/comments/2zysz7/ayy/ - the thing after /comments/)
# comments = redApi.getComments(submission)
def getComments(submission):
requestUrl = 'https://oauth.reddit.com/' + submission.subreddit.url + 'comments/article?&limit=1000&showmore=true&article=' + submission.id
allData = makeRequest(requestUrl)
articleData = allData[0]
comments = allData[1]
curComments = comments['data']['children']
resultComments = getCommentsHelper(curComments, submission.name, submission)
return resultComments
# Print out the tree of comments
def printTree(comments):
return printTreeHelper(comments, "")
def printTreeHelper(comments, curIndentation):
resultString = ""
for comment in comments:
resultString += curIndentation + comment['data']['body'].replace("\n", "\n" + curIndentation) + "\n"
if not comment['data']['replies'] == "":
resultString += printTreeHelper(comment['data']['replies']['data']['children'], curIndentation + " ")
return resultString
# Get all comments as a single array
def flattenTree(comments):
allComments = []
for comment in comments:
allComments.append(comment)
if not comment['data']['replies'] == "":
allComments += flattenTree(comment['data']['replies']['data']['children'])
return allComments
# Utility functions for getComments
def expandCommentList(commentList, submission):
curComments = commentList
allComments = {}
while True:
thingsToExpand = []
nextComments = []
allParents = {}
for comment in curComments:
if comment['kind'] == "more":
thingsToExpand += comment['data']['children']
else:
if comment['data']['body'][:len("If they are shipping")] == "If they are shipping":
print comment
allComments[comment['data']['name']] = comment
if len(thingsToExpand) == 0:
curComments = []
break
curComments = []
if not len(thingsToExpand) == 0:
print "total things to expand: " + str(len(thingsToExpand))
for i in range(0, len(thingsToExpand)/100+1):
curCommentIds = thingsToExpand[i*100:min((i+1)*100, len(thingsToExpand))]
requestUrl = 'https://oauth.reddit.com/api/morechildren.json?api_type=json&link_id=' + submission.name + '&limit=1000&showmore=true&children=' + ",".join(curCommentIds)
curData = makeRequest(requestUrl)
if 'json' in curData and 'data' in curData['json']:
curComments += curData['json']['data']['things']
print (i+1)*100
for comment in curComments:
allComments[comment['data']['name']] = comment
return allComments.values()
def lookForMore(comment):
if comment['kind'] == "more":
return True
if not comment['data']['replies'] == "":
for reply in comment['data']['replies']['data']['children']:
if lookForMore(reply):
return True
return False
def getCommentsHelper(curComments, rootId, submission):
allComments = expandCommentList(curComments, submission)
commentMap = {}
for comment in allComments:
commentMap[comment['data']['name']] = comment
allRootComments = []
for comment in allComments:
if comment['data']['parent_id'] == rootId:
allRootComments.append(comment)
elif comment['data']['parent_id'] in commentMap:
parentComment = commentMap[comment['data']['parent_id']]
if parentComment['data']['replies'] == "":
parentComment['data']['replies'] = {'data': {'children': []}}
alreadyChild = False
for childComment in parentComment['data']['replies']['data']['children']:
if childComment['data']['name'] == comment['data']['name']:
alreadyChild = True
break
if not alreadyChild:
parentComment['data']['replies']['data']['children'].append(comment)
else:
print "pls halp"
completedComments = []
needMoreComments = []
for comment in allRootComments:
if not comment['data']['replies'] == "" or comment['kind'] == 'more':
hasMore = lookForMore(comment)
if hasMore:
needMoreComments.append(comment)
else:
replyComments = getCommentsHelper(comment['data']['replies']['data']['children'], comment['data']['name'], submission)
comment['data']['replies']['data']['children'] = replyComments
completedComments.append(comment)
else:
completedComments.append(comment)
for comment in needMoreComments:
requestUrl = 'https://oauth.reddit.com/' + submission.subreddit.url + 'comments/article?&limit=1000&showmore=true&article=' + submission.id + "&comment=" + comment['data']['id']
allData = makeRequest(requestUrl)
articleData = allData[0]
comment = allData[1]['data']['children'][0]
if comment['data']['replies'] == "":
completedComments.append(comment)
else:
comments = comment['data']['replies']['data']['children']
actualComments = getCommentsHelper(comments, comment['data']['name'], submission)
comment['data']['replies']['data']['children'] = actualComments
completedComments.append(comment)
return completedComments
To use this script, in a python prompt, type the following:
# Get all comments from a post
# Submission is a praw submission, obtained via:
r = redApi.getPraw()
submission = r.get_submission(submission_id='2zysz7') # (or some other submission id, found via https://www.reddit.com/r/test/comments/2zysz7/ayy/ - the thing after /comments/)
comments = redApi.getComments(submission)
回答2:
Looks like praw has been updated? In 4.5.1 it looks more like:
#!/usr/local/bin/python
import praw
reddit = praw.Reddit(
client_id='<client_id>',
client_secret='<client_secret>',
user_agent='davehodg/0.1')
submission = reddit.submission(id='<submission_id>')
for comment in submission.comments.list():
print(comment.body)
Edit: seems like the most I can get back is 1000 comments?
回答3:
Im adding a bunch of prints and debugging, but right now @danielle your script does nothing. Just returned back to prompt.
来源：https://stackoverflow.com/questions/36366388/get-all-comments-from-a-specific-reddit-thread-in-python