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# Python: For loop problem

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## Tags :

Python: For loop problem , Python: , loop , problem ,

## Problem with for-loop in python

Tag : python , By : Lunis Neko
Date : March 29 2020, 07:55 AM
help you fix your problem The key-extractor Alex mentions is trivial enough to put in a lambda function
``````>>> array = ['ca', 'bd', 'ac', 'ab']
>>> order = ['a', 'b', 'c', 'd']
>>> sorted(array, key=lambda v:map(order.index,v))
['ab', 'ac', 'bd', 'ca']

>>> order = ['b', 'a', 'c', 'd']
>>> sorted(array, key=lambda v:map(order.index,v))
['bd', 'ab', 'ac', 'ca']

>>> order = ['d', 'c', 'b', 'a']
>>> sorted(array, key=lambda v:map(order.index,v))
['ca', 'bd', 'ac', 'ab']
``````
``````>>> order = ['a', 'b', 'c', 'd']
>>> map(order.index,array[0])
[2, 0]
>>> map(order.index,array[1])
[1, 3]
>>> map(order.index,array[2])
[0, 2]
>>> map(order.index,array[3])
[0, 1]
``````

## For Loop problem in Python

Tag : python , By : Henry Fatino
Date : March 29 2020, 07:55 AM
wish of those help I think this is because you are not resetting start_position; variables in Python are scoped to their enclosing function or class or module, but not to their enclosing loop. So try adding this line:
``````for x in authorList:
start_position = 0   # Add this
while True:
``````

## While Loop Breaking Problem (Python)

Tag : python , By : ERaubenheimer
Date : March 29 2020, 07:55 AM
it helps some times I am currently trying to connect to a GPS Bluetooth device. My Python 2.7 code worked correctly initially but I have now tried to implement my code into a while loop so that, whilst my device is not available, it will continue to keep on looping for it. Unfortunately, my code seems to be stuck in a loop and repeatedly prints out the error message "Unable to Locate Bluetooth GPS Device. Retrying..." I'm using the Bluetooth module from PyBluez. , The line
``````discovered_devices = discover_devices()
``````
``````else:
continue
break
``````

## Problem with Loop In Python loop is not defined

Tag : python , By : Don Changer
Date : December 24 2020, 03:30 AM
should help you out the problem is that you put Loop (note Capital L) and then loop (note not Capital l) this should work:
``````Loop = True
while Loop:
print ("hi")
``````

## i have a problem with strings and for loop in python

Tag : python , By : Kenny
Date : March 29 2020, 07:55 AM
Does that help I assume you are quite new to programing, so use a the following for loop:
``````name = "mohammadhosein"
output = ''
for i, c in enumerate(name):
if i % 2 == 0:
output += c.upper()
else:
output += c

``````>>> ''.join([c.upper() if i % 2 == 0 else c for i, c in enumerate(name)])
``````for index in range(0, len(name)):