python - Subtract a year if the previous month was January -

-



after processing able create below dataframe. problem year incorrect. date in decreasing order each location. after 2015-01-15 should 2014-12-15, not 2015-12-15.

+--------------------+---------------+-------+ |   location         | date          | value | +--------------------+---------------+-------+ | india              | 2015-03-15    |   -200| | india              | 2015-02-15    |  140  | | india              | 2015-01-15    |  155  | | india              | 2015-12-15    |   85  | | india              | 2015-11-15    |   45  | | china              | 2015-03-15    |   199 | | china              | 2015-02-15    |  164  | | china              | 2015-01-15    |  209  | | china              | 2015-12-15    |   24  | | china              | 2015-11-15    |   11  | | russia             | 2015-03-15    |   48  | | russia             | 2015-02-15    |  104  | | russia             | 2015-01-15    |  106  | | russia             | 2015-12-15    |   -20 | | russia             | 2015-11-15    |   10  |

making strong assumption these monthly dates ending on 15th of every month , first value given location correct, can step backwards monthly location.

# create original dataframe. df = pd.dataframe({'location': ['india'] * 5 + ['china'] * 5 + ['russia'] * 5,                    'date': ['2015-03-15', '2015-02-15', '2015-01-15', '2015-12-15', '2015-11-15'] * 3,                    'value': [-200, 140, 155, 85, 45, 199, 164, 209, 24, 11, 48, 104, 106, -20, 10]})[     ['location', 'date', 'value'] ] # convert dates pandas timestamps. df['date'] = pd.datetimeindex(df['date'])  gb = df.groupby(['location'])['date'] df['date'] = [     str(first_period - months) + '-15'      location_months, first_period in zip(          gb.count(), gb.first().apply(lambda date: pd.period(date, 'm')))       months in range(location_months) ] >>> df    location        date  value 0     india  2015-03-15   -200 1     india  2015-02-15    140 2     india  2015-01-15    155 3     india  2014-12-15     85 4     india  2014-11-15     45 5     china  2015-03-15    199 6     china  2015-02-15    164 7     china  2015-01-15    209 8     china  2014-12-15     24 9     china  2014-11-15     11 10   russia  2015-03-15     48 11   russia  2015-02-15    104 12   russia  2015-01-15    106 13   russia  2014-12-15    -20 14   russia  2014-11-15     10

the final dates in string form may again wish convert timestamps via:

df['date'] = pd.datetimeindex(df['date'])




wiki

Comments

Post a Comment

Popular posts from this blog

python - Read npy file directly from S3 StreamingBody -

-
i have many .npy (numpy) , .json files saved in s3, need download , load these files. for json files downloading files , loading dictionary using following code: obj = s3.object(bucket, key) response = obj.get() body = response['body'].read().decode('utf-8') data = json.loads(body) that way avoid writing .json file disk , reading it. now want same .npy files, equivalent? currently downloading file, saving temp file on disk , loading np.load avoid if possible. following https://stackoverflow.com/a/28196540/3509999 : obj = s3.object(bucket, key) io.bytesio(obj.get()["body"].read()) f: # rewind file f.seek(0) arr = np.load(f) wiki
Read more

kotlin - Out-projected type in generic interface prohibits the use of metod with generic parameter -

-
i start using kotlin , defined interface this: interface aadapter<vh : recyclerview.viewholder> { fun oncreateaviewholder(parent: viewgroup): vh fun onbindaviewholder(v: vh, position: int) } and when try use on code: class klasa ( private val adapter: aadapter<*> ) { fun dosth(){ //... val vh = this.adapter.oncreateaviewholder(parent) //on below line error adapter.onbindaviewholder(v, position) //... } } i error out-projected type 'aadapter<*>' prohibits use of 'public abstract fun onbindaviewholder(v: t, position: int): unit i tied add "in" or "out" definition i'm confused. how allow it. replace aadapter<*> aadapter<recyclerview.viewholder> . class klasa ( private val adapter: aadapter<recyclerview.viewholder> ) { // ... because have declared aadapter has type parameter vh type subclass of recyclerview....
Read more

Asterisk AGI Python Script to Dialplan does not work -

-
i'm stuck project have check database of sip extension incoming caller id , dial sip extension. below receive when run script on asterisk cli. -- registered sip '9125' @ 192.168.1.102:50142 > saved useragent "zoiper rv2.8.40" peer 9125 [2017-08-22 13:53:33] notice[5095]: chan_sip.c:24558 handle_response_peerpoke: peer '9125' reachable. (17ms / 2000ms) == using sip rtp tos bits 184 == using sip rtp cos mark 5 -- executing [0112617769@from-trunk:1] answer("sip/obitrunk1-0000000d", "") in new stack > 0x1ca50d0 -- probation passed - setting rtp source address 192.168.1.98:16834 -- executing [0112617769@from-trunk:2] agi("sip/obitrunk1-0000000d", "test.py") in new stack -- launched agi script /var/lib/asterisk/agi-bin/test.py args: ['/var/lib/asterisk/agi-bin/test.py'] env line: agi_request: test.py env line: agi_channel: sip/obitrunk1-0000000d env line: agi_language: en env line: a...
Read more