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Python for loop with index All In One

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收起

Python for loop with index All In One

带索引的 Python for 循环

error ❌

#!/usr/bin/python3

Blue = 17
GREEN = 27
RED = 22

LEDs = list([RED, GREEN, Blue])

for led,i in LEDs:
  print('led = ', LEDs[i])
  # 22, 27, 17

"""
Traceback (most recent call last):
  File "script.py", line 9, in 
    for led,i in LEDs:
TypeError: cannot unpack non-iterable int object

Exited with error status 1

"""

solution ✅

enumerate

https://docs.python.org/3/library/functions.html#enumerate

#!/usr/bin/python3

Blue = 17
GREEN = 27
RED = 22

LEDs = list([RED, GREEN, Blue])

# enumerate ✅
for index, led in enumerate(LEDs):
  print('led = ', LEDs[index])
  # 22, 27, 17

# 等价于，start default 0
for index, led in enumerate(LEDs, start=0):
  print('led = ', LEDs[index])
  # 22, 27, 17

"""
led =  22
led =  27
led =  17


"""

Python loop methods

  1. for
  1. wihle
while <expr>:
    <statement(s)>

while <expr>:
    <statement(s)>
else:
    <additional_statement(s)>
  1. ...

https://www.runoob.com/python3/python3-loop.html

demos

python for loop with index

#!/usr/bin/python3

Blue = 17
GREEN = 27
RED = 22

LEDs = list([RED, GREEN, Blue])

for index, led in enumerate(LEDs):
  print('led = ', LEDs[index])
  # 22, 27, 17

# 等价于，start default 0
for index, led in enumerate(LEDs, start=0):
  print('led = ', LEDs[index])
  # 22, 27, 17

image

https://www.runoob.com/try/runcode.php?filename=HelloWorld&type=python3

REPL

https://www.runoob.com/try/runcode.php?filename=HelloWorld&type=python3

PEP

Python Enhancement Proposals / Python 增强建议

PEP 8 – Style Guide for Python Code

https://peps.python.org/pep-0008/

PEP 279 – The enumerate() built-in function

https://peps.python.org/pep-0279/

refs

https://stackoverflow.com/questions/522563/accessing-the-index-in-for-loops

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