simple crud usando pickle
Publicado por Horacio (19 intervenciones) el 02/07/2016 00:01:59
Buenas les muestro el codigo que hice de un simple crud de banco con los campos id, descripcion. mi duda es como recorrer los objetos dentro del archivo con pickle por que lo que use fue cargar el contenido, procesar, eliminar el archivo y guardar.
Desde ya ,gracias
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
import pickle, osclass Bank:def __init__(self, id, description):
self.id = id
self.description = description
def __str__(self):
return "Id: {0}\nDescription: {1}".format(self.id, self.description)
class Banks:def __init__(self):
self.filename = 'banks.txt'
self.load()
def load(self):
try:with open(self.filename, 'rb') as f:
self.banks = pickle.load(f)
except:self.banks = []
def exists(self, code):
if self.banks:
for b in self.banks:
if b.id == code:
return True
return False
def save_data(self):
if os.path.isfile(self.filename):
os.remove(self.filename)
with open(self.filename, 'wb') as f:
pickle.dump(self.banks, f)
def search(self, code):
for pos, b in enumerate(self.banks):
if b.id == code:
return pos, b return 0, Nonedef add_bank(self, code):
description = raw_input("Description: ")
bank = Bank(code, description)
self.banks.append(bank)
self.save_data()
def show_bank(self, code):
if self.exists(code):
pos, bank = self.search(code)
print bank
else: print "bank does not exist"raw_input("Press ENTER to continue")
def update(self, code):
if self.exists(code):
pos, bank = self.search(code)
print bank
print "Write new data: "description = raw_input('Description:')
self.banks[pos].description = description
self.save_data()
print "successfully updated" else: print "Bank does not exist"raw_input("Press ENTER to continue")
def delete(self, code):
if self.exists(code):
pos, bank = self.search(code)
print bank
confirm = raw_input("Are you sure? (Y/N): ").upper()
if confirm == 'Y':
del self.banks[pos]
self.save_data()
print "successfully deleted" else: print "Bank does not exist"raw_input("Press ENTER to continue")
def menu():
while True:prompt = "1) Create\n"
prompt += "2) Read\n"
prompt += "3) Update\n"
prompt += "4) Delete\n"
prompt += "5) Exit\n"
prompt += "Choose: "
choose = int(raw_input(prompt))
banks = Banks()
if choose == 1:
code = int(raw_input("Id Bank: "))
if not banks.exists(code):
banks.add_bank(code)
print "successfully recorded" else: print "bank already exists"raw_input("Press Enter to continue")
elif choose == 2:
code = int(raw_input("Id Bank: "))
banks.show_bank(code)
elif choose == 3:
code = int(raw_input("Id Bank: "))
banks.update(code)
elif choose == 4:
code = int(raw_input("Id Bank: "))
banks.delete(code)
elif choose == 5:
break
menu()
Desde ya ,gracias
Valora esta pregunta
0