1. For loop: our last loop type
We use For loops when we know exactly how many times the loop will occur
A subset of the the other two loops
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())

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

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
for x in range(5): # range(5) = [0,1,2,3,4]

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())
for x in range(-3,3,2):
# from -3 up to but not including 3, by increments of 2, e.g., [-3,-1,1]
(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. What does this do?
def f(v): var1 = "" for x in range(len(v) - 1,-1,-2): var1 += v[x]; return(var1) print(f("kebijrtese"))
class 1,2

10. 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())

11. 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)

12. How about this one?
def f(word): newstr = "" for i in range(1,len(word)+1): newstr += word[-i] return(newstr) wvar = "live" print(f(wvar))

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

14. What does this do? Add x 1s to the matrix in random places?
def p(x,m):
i = 0
while (i < x): #why didn’t I use a for loop here?
b = randrange(len(m))
c = randrange(len(m[b]))
if m[b][c] != 1:
m[b][c] = 1
i+= 1
return(m)
m = p(7,m)
for x in range(4):
print(m[x])
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) #what is this? for x in range(4): print(m[x])

15. Print out the matrix:
Print out matrix with tabs between each num in each row, e.g.,:
def q(m):
for x in range(len(m)):
for y in range(len(m[x])):
print(m[x][y],end = "\t")
print()
return
q(m)