Fight System Test

import random
"""
    I need cannot get playerMana to decrement when they cast fireball... I don't get it :/ I have used multiple methods.
    I tried to do playerMana-=50 but that did not work either...
    Skype: wetdog54
"""
#player stats
playerLevel = 1
playerHp = 85+15*playerLevel
playerMana = 130+20*playerLevel
playerExp = 75
ressurects = 3

#experience calculations
playerExpForLevel = playerLevel*100
playerExpToLevel = playerExpForLevel - playerExp
playerExpPercent = (playerExp / playerExpForLevel) * 100

#boss or regular mob
randNum=8 #random.randint(1,10)

if randNum >= 7:
    print "A boss has appeared!\n"
    bossHp=random.randint(100,200)*playerLevel
    while bossHp > 0:
        print "The boss has " + `bossHp` + " HP!\n"
        print "You are level " + `playerLevel` + "!\nYour HP: " + `playerHp` + "!\nYour Mana: " + `playerMana`
        print "You are " + `playerExpPercent` + "% through this level, and need " + `playerExpToLevel` + " more exp!\n"
        print "Choose an attack...\n1. Fireball (50% hit, 50 mana)\n2. Melee (80% hit, 0 mana)"
        attack=raw_input("Attack: ")
        if attack == 1:
            playerMana=playerMana-50
            hitChance = random.randint(1,10)
            if hitChance >= 5:
                critChance = random.randint(1,10)
                if critChance >= 8:
                    #player does critical hit, adding 10 damage, plus an additional 5 per level
                    fireballHit = random.randint(35,85)*playerLevel
                    bossDamage = fireballHit + 5*playerLevel
                    bossHp-=bossDamage
                    print "You crit the boss for " + `bossDamage` + " HP!\n\n"
                else:
                    #player does regular hit
                    fireballHit = random.randint(25,75)*playerLevel
                    bossHp-= fireballHit
                    print "You hit the boss for " + `fireballHit` + " HP!\n\n"
            else:
                print "You miss the boss, and deal no damage!\n\n"
        else:
            #melee attack, no mana consumption
            hitChance = random.randint(1,10)
            if hitChance <= 8:
                #player will hit
                critChance = random.randint(1,10)
                if critChance >= 8:
                    #player does critical hit, adding10 damage, plus an additional 5 per level
                    meleeHit=random.randint(30,60)*playerLevel
                    bossDamage = meleeHit + 4*playerLevel
                    bossHp-=bossDamage
                    print "You crit the boss for " + `bossDamage` + " HP!\n\n"
                else:
                    #player does normal hit
                    meleeHit=random.randint(20,50)*playerLevel
                    bossHp-=meleeHit
                    print "You crit the boss for " + `meleeHit` + " HP!\n\n"
            else:
                print "You miss the boss, and deal no damage!\n\n"


else:
    print "A mob has appeared!\n"