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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()
kz.sort(bynumber)

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
NULL 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

Books covering this topic
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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.

Full description of the source code
You can learn more about this example on the training courses listed on this page, on which you'll be given a full set of training notes.

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Other resources
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