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Sorting and subsorting into your own order
More on Collections and Sequences example from a Well House Consultants training course
More on More on Collections and Sequences [link]

This example is described in the following article(s):
   • Moving from scripting to Object Orientation in Python - [link]
   • Accessing variables across subroutine boundaries - Perl, Python, Java and Tcl - [link]

Source code: rails_dict Module: Y111
# Sorting and subsorting into your own order

import re

class station:
        def __init__(this,text):
                bits = text.strip().split("\t")
                letters = re.compile('[A-Z]+')
                this.zone = letters.findall(bits[2])
                this.postcode = bits[2]
                this.name = bits[6]
                this.code = bits[1]
                this.osref = bits[3]
                this.byyear = bits[7:]
        def getsuperzone(this):
                if len(this.zone) < 1: return "absent"
                return this.zone[0]
        def getcode(this):
                return this.code
        def getosref(this):
                return this.osref
        def getyear(this,which):
                return this.byyear[which-2005]
        def getname(this):
                return this.name
        def namematch(this,wanted):
                if this.name.find(wanted) >= 0:
                        return True
                return False
        def small(this):
                if this.byyear[-1] == "NULL": return False
                if int(this.byyear[-1]) > 1000: return False
                return True

# 1975 BUD LA9 6RD SD 502958 54.355307679 -2.7662155197
# Burneside 7759 9392 9561 12394 13776 16112

def bynumber (home, away):
        fred = cmp(count[home],count[away])
        if fred == 0: fred = cmp(home,away)
        return fred

fh = open("railstats.xyz")
count = {}

for place in fh.xreadlines():

        current = station(place)
        pctop = current.getsuperzone()

        previous = count.get(pctop,0)
        count[pctop] = previous + 1

kz = count.keys()

for zone in kz:
        print zone, count[zone]

""" Here's how it runs:

munchkin:ps grahamellis$ python rails_dict
DS 1
GH 1
LH 1
P 1
TD 1
WC 1
absent 1
DH 2
SR 2
HR 3
HX 4
IG 4
NN 4
TA 4
TF 4
HG 5
SN 5
DG 6
LN 6
LU 6
SP 6
TQ 6
WV 6
AB 8
EC 8
UB 8
DL 9
DY 9
GL 9
HU 9
WR 9
DD 10
DT 10
FY 10
AL 11
BL 11
LE 11
WD 11
BH 12
FK 12
HD 12
KW 12
SM 12
WN 12
HA 13
LD 13
ST 13
W 13
WS 13
CB 14
DE 14
MK 14
RM 14
BA 15
CW 15
OL 15
PR 15
CV 16
NP 17
SL 17
BD 18
HP 18
PE 18
SG 18
TR 18
KY 19
SS 19
SY 19
EN 20
IP 20
OX 20
WF 20
BB 21
DA 21
TS 21
BR 22
CR 22
NE 22
CM 23
CO 23
LS 23
BS 24
NW 24
TW 24
CA 25
E 25
ML 25
PH 26
KA 27
PL 27
PO 27
WA 27
CT 28
EH 28
IV 28
SW 28
YO 28
SO 29
LA 31
N 31
NR 31
PA 31
RG 31
EX 32
S 32
ME 33
GU 34
RH 35
NG 36
BN 39
DN 39
KT 39
M 40
SA 41
CH 42
SK 48
L 50
TN 54
SE 55
LL 60
B 69
CF 75
G 109
munchkin:ps grahamellis$


Learn about this subject
This module and example are covered on the following public courses:
 * Learning to program in Python
 * Python Programming
 * Intermediate Python
Also available on on site courses for larger groups

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Other Examples
This example comes from our "More on Collections and Sequences" training module. You'll find a description of the topic and some other closely related examples on the "More on Collections and Sequences" module index page.

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