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Hellas.Athens module

This module contains only scientific functions and it is named after the ancient city of Athens and Athena the godness of science

Hellas.Athens.ngrams(slice_able, n)[source]

produces ngram of an object :param obj slice_able: any slicable object i.e string list etc :param int n: n-th grams

Returns:

an iterator of ngram tuples (actually returns a list in Python 2.7) but always treat it as iterator for python 3+ compatibility)
Example:
>>> ngrams("The quick brown fox jumps over the lazy dog", 2)
[('T', 'h'), ('h', 'e'), ('e', ' '), (' ', 'q'), ('q', 'u'), ('u', 'i'), ('i', 'c') .... ]

See also

bigrams()

Hellas.Athens.bigrams(slice_able)[source]

produces bigrams same as ngrams (x, 2) but more efficient

Returns:
an iterator of bigram tuples

(actually returns a list in Python 2.7) but always treat it as iterator for python 3+ compatibility)

See also

ngrams()
Hellas.Athens.haversine(lon1, lat1, lon2, lat2)[source]

Calculate the great circle distance between two points on earth in Kilometers on the earth (specified in decimal degrees)

See also

distance_points()

Parameters:
  • lon1 (float) – longitude of first place (decimal degrees)
  • lat1 (float) – latitude of first place (decimal degrees)
  • lon2 (float) – longitude of second place (decimal degrees)
  • lat2 (float) – latitude of second place (decimal degrees)
Example:
>>> London_long=-0.126 ; London_lat=51.50; Paris_long = 2.350; Paris_lat = 48.856
>>> haversine(London_long, London_lat, Paris_long, Paris_lat)
342.55375272454864
Returns:

float distance in Kilometers
Hellas.Athens.distance_points(point1, point2)[source]

just a wrapper for haversine()

Parameters:
  • point1 (tuple_or_list) – (longitude, latitude) in decimal degrees
  • point2 (tuple_or_list) – (longitude, latitude) in decimal degrees
Example:
>>> London = (-0.1262, 51.50,); Paris = (2.350, 48.856)
>>> distance_points(London, Paris)
342.55
Hellas.Athens.bit_set(offset, int_tp=0)[source]

sets bit of int_tp at offset to 1

Parameters:
  • offset (int) – position offset
  • int_tp (int) – original integer or long (defaults to 0)
Returns:

a new int or long
Example:
>>> bit_set(2)
4
>>> bit_set(2,4)
4                            # because bit already set
>>> bin(bit_set(16))
'0b10000000000000000'
Hellas.Athens.bits_count(int_tp)[source]

counts all bits set to 1 in int_tp

Example:
>>> bits_count(1234567)
11