python for range (-10,10) code example

Example 1: for in range loop python

#there are two possibilities for a for loop
#first one is with a range()
#range() just generates lists after the following pattern

print(range(4))
>>> [0,1,2,3]
print(range(1,4))
>>> [1,2,3]
print(range(2,10,2))
>>> [2,4,6,8]

#and what the for does then is that it lets a variable (in my example x) cycle trough the list given after in

for x in range(2,10,2):
  print(x)
>>> 2
>>> 4
>>> 6
>>> 8

#so the code in the loop gets executed for every value in the given list after in
#you can also use for ... in for custom lists
#example 1:

list1 = [1,2,50,2]

for x in list1:
  print(x)

>>> 1
>>> 2
>>> 50
>>> 2

#example 2

list2 = ["bananas", "apples", "pears"]

for x in list2:
  print(x)

>>> "bananas"
>>> "apples"
>>> "pears"

Example 2: range python 3

# range(start, stop, step)
  # start = index to begin at (INCLUSIVE)
  # stop = generate numbers up to, but not including this number (EXCLUSIVE)
  # step = (can be omitted) difference between each number in the sequence

arr = [19,5,3,22,13]

# range(stop)
for i in range(len(arr)):
    print(arr[i]) # prints: 19, 5, 3, 22, 13

# range(start, stop)
for i in range(2, len(arr)):
    print(arr[i]) # prints: 3, 22, 13
    
# range(start, stop, step)
for i in range(0, len(arr), 2):
    print(arr[i]) # prints: 19, 3, 13
    
# reverse:
for i in range(len(arr)-1, -1, -1):
    print(arr[i])

Example 3: class range python code

class Range:
   def __init__(self, start, end):
      self.setStart(start)
      self.setEnd(end)
   def getStart(self):
      return self.start
   def setStart(self, s):
      self.start = s
   def getEnd(self):
      return self.end
   def setEnd(self, e):
      self.end = e
   def getLength(self):
      return len(range(self.start, self.end))
   def overlaps(self, r):
      if (r.getStart() < self.getEnd() and r.getEnd() >= self.getEnd()) or \
         (self.getStart() < r.getEnd() and self.getEnd() >= r.getEnd()) or \
         (self.getStart() >= r.getStart() and self.getEnd() <= r.getEnd()) or \
         (r.getStart() >= self.getStart() and r.getEnd() <= self.getEnd()):
          return True
      else:
          return False

Example 4: for i in range python

times_repeated = 10

for i in range(1, times_repeated + 1): #1 is the starting point and times_repeated is how much times the loop with run.
  print(i) #Prints 1 2 3 4 ... 10