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# List unique values in a DataFrame column
pd.unique(df.column_name.ravel())

# Convert Series datatype to numeric, getting rid of any non-numeric values
df['col'] = df['col'].astype(str).convert_objects(convert_numeric=True)

# Grab DataFrame rows where column has certain values
valuelist = ['value1', 'value2', 'value3']
df = df[df.column.isin(valuelist)]

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if any(bad in name for bad in NOT_ALLOWED):
    raise ValueError("'name' may not contain any of {}".format(NOT_ALLOWED)

if not all(isinstance(val, int) for val in DATA) or len(DATA) !=2:
    raise ValueError("'DATA' must consist of 2 ints")

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dict([[h.partition(':')[0], h.partition(':')[2]] for h in rawheaders.split('\n')])

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import requests # just a choice of comfort for me
def download(url_address, filename):
    response = requests.get(url_address, stream=True)
    response.raise_for_status()
    with open(filename, "wb") as f:
        total_length = response.headers.get('content-length')
        if total_length is None:
            f.write(response.content)
        else:
            total_length = int(total_length)

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import pandas as pd
df = pd.DataFrame({'AAA' : [4,5,6,7], 'BBB' : [10,20,30,40],'CCC' : [100,50,-30,-50]}); df
'''   
   AAA  BBB  CCC
0    4   10  100
1    5   20   50
2    6   30  -30
3    7   40  -50
'''

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#!/usr/bin/env python3.0

import sys, array, tempfile, heapq
assert array.array('i').itemsize == 4

def intsfromfile(f):
    while True:
        a = array.array('i')
        a.fromstring(f.read(4000))
        if not a:

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import pandas as pd
df = pd.read_csv(r'data.csv', encoding='utf8')
df['score'] = df['score'].str.replace('%', '')
score_df = (df['score'].sort_values(ascending=False)[:5])
indexes = score_df.index
print (df.iloc[indexes])

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def get_file_md5(f, chunk_size=8192):
    h = hashlib.md5()
    while True:
        chunk = f.read(chunk_size)
        if not chunk:
            break
        h.update(chunk)
    return h.hexdigest()

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import os, time
import threading, Queue

class WorkerThread(threading.Thread):
    """ A worker thread that takes directory names from a queue, finds all
        files in them recursively and reports the result.

        Input is done by placing directory names (as strings) into the
        Queue passed in dir_q.

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• Keywords: #books #mentalhealth #life

• 

• Age limit: 120 (cell regeneration stops)

• 5 Blue Zones in the World (the geographic regions where people live longest)

• There's no word that means "retire" in Japanese

• Diet, exercise, finding a purpose in life, forming strong social ties

• 1800-1900 calories per day (eat only 80%)

• The secrets to slowing down aging process