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For loop: another type of loop

For loop: another type of loop. We use For loops when we know exactly how many times the loop will occur Form: for variable in [ value1, value2,value3… lastvalue ]: calculations Example: def f(): for x in [1,2,3,4,5]: print(x) return(x) print(f()). More for loops:. def f():

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For loop: another type of loop

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  1. For loop: another type of loop • We use For loops when we know exactly how many times the loop will occur • Form: forvariablein [value1, value2,value3…lastvalue]: calculations • Example: def f(): for x in [1,2,3,4,5]: print(x) return(x) print(f())

  2. More for loops: def f(): for x in [1,3,5,7,9]: print(x) return(x) print(f()) def f(): for x in [2,7,1,9,4]: print(x) return(x) print(f())

  3. More for loops: def f(): y = 0 ct = 0 for x in [3.2, 7.1, 8.0, 3.4, 5.1]: print("including " + str(x)) ct +=1 y = y + x return(y/ct) print(f())

  4. Loops with strings: def f(y): ct = 0 for x in ["puppy","bunny","puppy","bird","echidna","puppy"]: if x == y: ct += 1 return(ct) print(f("puppy"))

  5. More for loops: def f(): for x in [0,1,2,3,4]: print(x) return(x) print(f()) • Shortcut: using range def f(): for x in range(5): # range(5) = [0,1,2,3,4] print(x) return(x) print(f())

  6. Same? def whilefunc(y): count = 0 total = 0 while (count < y): total += count count += 1 return (total) print(whilefunc(5)) def forfunc(y): total = 0 for x in range(y): total += x return(total) print(forfunc(5))

  7. More on Range: def f(): for x in range(-3,3): # from -3 up to but not including 3, e.g., [-3,-2,-1,0,1,2] print(x) return(x) print(f()) def f(): for x in range(-3,3,2): # from -3 up to but not including 3, by increments of 2, e.g., [-3,-1,1] print(x) return(x) print(f()) (Can we make a loop go backwards?)

  8. What does this do? def f(ls): y = 1000 total = 0 for x in ls: total = total + int(x) * int(y) y /=10 return(total) print(f(["2","7","1","9"]))

  9. How about this? def f(z): y = int(input("enter a number: ")) for x in range(1,y): for q in range(1,z): print (str(q)+ "*"+str(x)+"=\t"+str(x*q)) print ("\n") return f(4)

  10. What does this do? def f(): strvar = input("enter a string: ") var1 = "" for x in range(len(strvar) - 1,-1,-1): var1 += strvar[x]; return(var1) print(f())

  11. This one? def f(): strvar = input("enter a number: ") y = 1 z = 0 var1 = "" for x in range(len(strvar) - 1,-1,-1): z += int(strvar[x]) * y; y*=10 return(z) print(f())

  12. defgib(w,n): v = "aeiouy" for x in w: if x in v: n += "ithag" n+=x return(n) print(gib("puppy",""))

  13. What does this give you? def f(lv): x = len(lv) print(x) for y in range(0,x): if "t" in lv[y]: print(lv[y]) return listvar = ["ham","am","boat","goat","there","anywhere"] f(listvar)

  14. What does this do? deff(word): high = len(word) low = 0 newstr= "" for i in range(10): position = randrange(low, high) newstr+= word[position] return(newstr) wvar = "sesquipedalian" print(f(wvar))

  15. What does this do? def k(m,n): v = [] for x in range(m): ls = [] for y in range(n): ls.append(0) v.append(ls) return(v) m = k(4,5) for x in range(4): print(m[x])

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