For loop in Python

for_loop.py

# For loops in Python works like iterator in other language
# Execute a set of statements, once for each item in a list, tuple or set

# Print name in a list of names
names = ["John", "Henry", "Matt", "Rocky"]
for name in names:
  print(name)

# >>>John
# >>>Henry
# >>>Matt
# >>>Rocky
# --------------------------------------------

# You can loop through characters of a string
for char in "Habanna":
  print(char)
# >>>H
# >>>a
# >>>b
# >>>a
# >>>n
# >>>n
# >>>a
# --------------------------------------------

# Break from the loop
# Break when reach "Matt" before printing it
names = ["John", "Henry", "Matt", "Rocky"]
for name in names:
  if name == "Matt":
    break
  print(name)

# >>>John
# >>>Henry
# --------------------------------------------

# With the continue statement we can stop the current iteration of the loop, 
# and continue with the next
# Don't print "Matt"
names = ["John", "Henry", "Matt", "Rocky"]
for name in names:
  if name == "Matt":
    continue
  print(name)
# >>>John
# >>>Henry
# >>>Rocky
# --------------------------------------------

# Using range() function
for x in range(4):
  print(x)
# >>>0
# >>>1
# >>>2
# >>>3
# --------------------------------------------

# Using range with start parameter
for x in range(2,4):
  print(x)
# >>>2
# >>>3
# --------------------------------------------

# Using range with increment sequence 
# default increment is 1
for x in range (2,6,3):
  print(x)
# >>>2
# >>>5
# --------------------------------------------

# Else in For Loop
# The else keyword in a for loop specifies a block of code 
# to be executed when the loop is finished:
for x in range (3):
  print(x)
else:
  print("Completed!")
# --------------------------------------------

# Nested loop
names = ["John", "Henry", "Matt", "Rocky"]
chars = ["handsome", "nice", "fun"]

for name in names:
  for char in chars:
    print(name, char)

# >>> John handsome
# >>> John nice
# >>> John fun
# >>> Henry handsome
# >>> Henry nice
# >>> Henry fun
# >>> Matt handsome
# >>> Matt nice
# >>> Matt fun
# >>> Rocky handsome
# >>> Rocky nice
# >>> Rocky fun