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a = 10 b = 3 print("a:", a, "b:", b) # prohozeni promennych s pomocnou promennou tmp = a a = b b = tmp print("a:", a, "b:", b) # prozeni promennych bez pomocne promenne a = a + b b = a - b a = a - b print("a:", a, "b:", b) # prohozeni promennych pomoci tuple (a, b) = (b, a) print("a:", a, "b:", b)
def obdelnik(arg): (a,b) = arg return (a*b) def kruznice(arg): return (3.14*(arg**2)) def vypocet(f, arg): return f(arg) print("obdelnik:", vypocet(obdelnik, (2,3))) print("kruznice:", vypocet(kruznice, 2.2))
# pole vytvorene vyctem a = [1, 2, 3] for i in range(len(a)): print("a[", i, "] = ", a[i]) y = 0 for i in a: print("a[", y, "] = ", i) y += 1 # prazdne pole b b = [] b += [10] b += [20] print(b) # prazdne pole c c = list() c.append(10) c.append(20) printc(c)
def pole(p): for i in range(len(p)): p[i] += 10 a = [1, 2, 3, 4] b = a # neni kopie, pouze reference print("b: ", b) a[3] = 100 print("b: ", b) # kopie pomoci rezu c = a[:] print("c: ", c) a[2] = 88 print("a: ", a) print("c: ", c) pole(c) print("c: ", c)
import random def vektor(delka, rozsah): "vektor nahodnych celych cisel" r = [] # pole, ktere budu na konci vracet for i in range(delka): # r += [random.randint(1, rozsah)] r.append(random.randint(1, rozsah)) return r def vektor1(delka, rozsah=100): return ([random.randint(1,rozsah) for i in range(delka)]) def soucet(x, y): "soucet vektoru x a y" return ([x[i]+y[i] for i in range(len(x))]) def soucin(x, y): "skalarni soucin vektoru x a y" s = 0 for i in range(len(x)): s += x[i]*y[i] return s a = vektor(10, 40) print(a) b = vektor1(10) print(b)
b = [[1, 22, 3], [4, 5, 18]] print("b: ", b) print("b[0]: ", b[0]) print("len(b): ", len(b)) print("b[1][1]: ", b[1][1]) for i in b: print(i) for i in range(len(b)): # pocet vektoru for j in range(len(b[0])): # delka vektoru print(str(b[i][j]).rjust(2), end=" ") print() garaz = [ ("petr", ["porsche", "bmw", "volvo"]), ("jan", ["bmw", "volvo"]), ("jiri", ["bmw", "porsche"])] p = 0 for i in garaz: (clovek, auta) = i if "porsche" in auta: p+=1 print("v garazi je ", p, "vozu znacky porsche") a = [[]] a[0] = [10, 20, 30] print(a) a.append([20, 30, 60]) print(a)