Error in Python D Not Defined

error in python d not defined.

In Python 2.x, input() expects something which is a Python expression, which means that if you type d it interprets that as a variable named d. If you typed "d", then it would be fine.

What you probably actually want for 2.x is raw_input(), which returns the entered value as a raw string instead of evaluating it.

Since you're getting this behavior, it looks like you're using a 2.x version of the Python interpreter - instead, I'd go to www.python.org and download a Python 3.x interpreter so that it will match up with the book you're using.

NameError: name 'd' is not defined in Python list comprehension

Inside your comprehension, where you wrote

for d in date_settings and d['date'] != None

you should have if, not and.

As you currently have it, the comprehension is trying to understand the expression

date_settings and d['date'] != None

as something that d should iterate through, which is why it doesn't know what d is supposed to mean here.

Variable not defined error even if it's defined

Steps to solve:
(1) Add 'instrument' to your global variable list:

list1 = ["Piano", "Keys"]
list2 = ["Piano", "Keys", "Bass", "Plucks", "Pads", "Guitar"]
list3 = ["Bass"]
list4 = ["Guitar", "Bass"]
list5 = ["Synth"]
instrument = ''

(2) in both the functions (below 'def' line) add

global instrument

Python throws a 'not defined' error at a declared function

search_val is not a global function. It is a member of the class, even though it's not using self.

If you need to have this as a member of the class, then you need to change the header to:

    def search_val(self, arr, low, high, x):

and you need to call it as:

        print(self.search_val(nums, low, high, target))`

If this is for a contest, they usually want you to RETURN the value, rather than PRINT the value.

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