python, roulette game

In the game of roulette there are many ways to bet, one of which is to bet on the red or black number. This is a simulation with probabilities a random number for said probability. On my roulette table there are red, black and green colors, to each one assign the probability 0.45, 0.90, 1 respectively. if the random # falls in any of the probabilities. the amount wagered increases or decreases by 1.
the player starts with $ 50.
the game ends when the player adds $ 250.
my code is this:

from random import random

i=1
cantIni=50
cantFin=250

print("CANT INI\tALEAT\tG/P\tCANT FIN")
while cantIni <=cantFin:
    aleatorio=random()
    if aleatorio<0.45:
        cantA=cantIni+1
        print("{}\t\t{}\tGANA\t{}".format(cantIni,str(aleatorio)[0:4],cantA))
    elif aleatorio<0.90:
        cantA=cantIni-1
        print("{}\t\t{}\tPIERDE\t{}".format(cantIni,str(aleatorio)[0:4],cantA))
    else:
        print("{}\t\t{}\t--\t{}".format(cantIni,str(aleatorio)[0:5],cantA))

    cantIni+=1
print("---------------------------------FIN-DEL-PROGRAMA-------------------------------")

the output of the program looks like this:

CANT INI        ALEAT   G/P     CANT FIN
50              0.72    PIERDE  49
51              0.12    GANA    52
52              0.41    GANA    53
53              0.61    PIERDE  52
54              0.30    GANA    55
55              0.95    --      55
56              0.23    GANA    57
57              0.51    PIERDE  56
58              0.28    GANA    59
59              0.20    GANA    60
60              0.76    PIERDE  59
61              0.05    GANA    62
62              0.86    PIERDE  61
63              0.86    PIERDE  62
64              0.46    PIERDE  63
65              0.10    GANA    66
66              0.89    PIERDE  65
67              0.01    GANA    68
68              0.91    --      68
69              0.40    GANA    70
70              0.68    PIERDE  69
71              0.45    PIERDE  70
72              0.23    GANA    73
73              0.71    PIERDE  72
74              0.88    PIERDE  73
75              0.26    GANA    76
-                 -        -     -
-                 -        -     -
-                 -        -     -
236             0.50    PIERDE  235
237             0.968   --      235
238             0.34    GANA    239
239             0.51    PIERDE  238
240             0.46    PIERDE  239
241             0.967   --      239
242             0.16    GANA    243
243             0.37    GANA    244
244             0.78    PIERDE  243
245             0.40    GANA    246
246             0.85    PIERDE  245
247             0.09    GANA    248
248             0.88    PIERDE  247
249             0.81    PIERDE  248
250             0.84    PIERDE  249
---------------------------------FIN-DEL-PROGRAMA-------------------------------

I have a mistake starting from the second iteration, since the initial quantity must be the final quantity of the previous one and so on until the final quantity of x itercion reaches 250, example:

CANT INI        ALEAT   G/P     CANT FIN
    50              0.72    PIERDE  49
    51              0.12    GANA    52

for the second iteration, initial amount should be 49.

Agradesco the answers and comments.