from machine import Pin
import time
"""
# What enumerate() does
# enumerate() lets you loop over something and keep track of the position at the same time.

# Instead of this:
time.sleep(.2)

liste=["a", "b", "c"]
for item in liste:
    print(item)  # a b c vertical
    print(liste) # ['a', 'b', 'c']
time.sleep(1)

i = 0
for item in ["a", "b", "c"]:
    print(i,item) # 0 a,1 b,2 c   vertical
    i += 1

for item in ["a", "b", "c"]:
    print(item) # a b c   vertical

#************* enumerate

# Basic syntax
# enumerate(iterable, start=0)
# iterable → list, tuple, string, etc.

# start → number to start counting from (default is 0)


for i, item in enumerate(["a", "b", "c"]):
    print(i, item) # 0 a,1 b,2 c   vertical


# Starting from a different number

for i, item in enumerate(["x", "y", "z"], start=2):
    print(i, item) # 3 a,4 b,5 c  vertical
    time.sleep(1)

myList=['x','y','z']
for i, item in enumerate(myList):
    
    print(i, item) # 0 x,1y,2 z   vertical

#********************************************

# Common real-world examples
#************ With a list

names = ["Alice", "Bob", "Charlie"]

for i, name in enumerate(names):
    print(f"{i}: {name}") # 0: Alice 1: Bob 2: Charlie  vertical


#************ With a string

for i, ch in enumerate("hello"):
    print(i, ch) 

 #  0 h
 #  1 e
 #  2 l
 #  3 l
 #  4 o

#*****When you need the index to modify a list

nums = [10, 20, 30]

for i, val in enumerate(nums):
    nums[i] = val * 2

print(nums) # [20, 40, 60]
"""
#*******************Dictionaries

# Nice one — enumerate() + dictionaries is a very common point of confusion, 
# so let’s clear it up cleanly 😄
# Important thing to know first

# When you loop over a dictionary by default, 
# you loop over its keys.

d = {"a": 10, "b": 20, "c": 30}

for x in d:
    print(x)
    time.sleep(1) # a,b,c


# 1️⃣ enumerate() over dictionary keys (most basic)

d = {"a": 10, "b": 20, "c": 30}

for i, key in enumerate(d):
    print(i, key) # 0 c,1 a,2 b vertical

# 2️⃣ enumerate() with dict.keys() (same result, more explicit)

for i, key in enumerate(d.keys()):
    print(i, key, d[key]) # 0 a 10,1 b 20,2 c 30 vertical

# 3️⃣ enumerate() with dict.values()

for i, value in enumerate(d.values()):
    print(i, value) # 0 10,1 20,2 30 vertical

# 4️⃣ enumerate() with dict.items() (most useful)
# This is the one you’ll use all the time.

for i, (key, value) in enumerate(d.items()):
       print(i, key, value) # 0 a 10,1 b 20,2 c 30 vertical

# 5️⃣ Starting index from 1 (common in reports / logs)

for i, (key, value) in enumerate(d.items(), start=1):
    print(f"{i}. {key} = {value}")
    # 1. a = 10
    # 2. b = 20
    # 3. c = 30