check if this list exists in python

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https://stackoverflow.com/questions/11556234/how-to-check-if-a-list-exists-in-python
How to check if a list exists in Python
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Answer
13edited Aug 29, 2012 at 9:32
For the lists:

if a_list:
print "I'm not here"
The same is for the dicts:

if a_dict:
print "I'm not here"
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How to check if a list exists in Python - Stack Overflow
What is the easiest way to check to see if a list or dict exists in python ? Im using the following but this isn't working: if len(list) == 0: print "Im not here" Thanks,
✓ You can use a try/except block: try: #work with list except NameError: print "list isn't defined"
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- Naive Method. In Naive method, one easily uses a loop that iterates through all the …
  Using in. Python is the most conventional way to check if an element exists in a list or not. …
  Using set() + in. Converting the list into the set and then using in can possibly be more …
  Using sort() + bisect_left() The conventional binary search way of testing element existence, …
  Using count() We can use the in-built python List method, count(), to check if the passed …
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WEBSep 27, 2011 · On the other hand, if you want to check if values exist in a list and return the indices of the values that do, then regardless of the length of the list, for small number of …
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7 in a Clearest and fastest way to do it. You can also consider using a set , but constructing that set from your list may take more time than fas...
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As stated by others, in can be very slow for large lists. Here are some comparisons of the performances for in , set and bisect . Note the time (in...
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You could put your items into a set . Set lookups are very efficient. Try: s = set(a) if 7 in s: # do stuff edit In a comment you say that you'd...
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The original question was: What is the fastest way to know if a value exists in a list (a list with millions of values in it) and what its index i...
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def check_availability(element, collection: iter): return element in collection Usage check_availability('a', [1,2,3,4,'a','b','c']) I believe...
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a = [4,2,3,1,5,6] index = dict((y,x) for x,y in enumerate(a)) try: a_index = index[7] except KeyError: print "Not found" else: print "found"...
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If you only want to check the existence of one element in a list, 7 in list_data is the fastest solution. Note though that 7 in set_data is a nea...
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Be aware that the in operator tests not only equality ( == ) but also identity ( is ), the in logic for list s is roughly equivalent to the followi...
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It sounds like your application might gain advantage from the use of a Bloom Filter data structure. In short, a bloom filter look-up can tell you v...
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Conclusion
Python lists come with a number of different helpful methods. One of these methods is the .count()method, which counts the number of times an item appears in a list. Because of this, we can see if an item exists in a list if the count of that item is anything greater than 0. If the count is 0, then the item doesn’t exist in our list. Let’s see what...
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How to check if an item exists in a list in Python?Python lists come with a number of different helpful methods. One of these methods is the .count() method, which counts the number of times an item appears in a list. Because of this, we can see if an item exists in a list if the count of that item is anything greater than 0. If the count is 0, then the item doesn’t exist in our list.
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How to check if value exists in Python?Check If Value Exists In Python Using a For Loop In this example, below code iterates through the list of people and checks if there is a person with age 30. If found, it prints “A person with age 30 exists in the list,” otherwise, it prints “No person with age 30 found in the list.” print(f"A person with age {target_age} exists in the list.")
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How to check if an element is present in a Python list?If you are in a hurry, below are some quick examples of how to check whether the element is present in the list or not. print("Exist!") print("Not exist!") print("Exist!") print("Not exist!") print("Exist!") print("Not exist!") marks.index(78) print("Exist!") print("Not exist!") 2. Check if Python List Contains Element using in Operator
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How do I check if a Python list contains an item?The Quick Answer: Use in To Check if a Python List Contains an Item One of the easiest and most Pythonic ways to check for membership in a Python list is to use the in key. Technically, the in keyword serves two purposes: In this case, we’ll use the in keyword to check if an item exists in a list.
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python - Pythonic way to check if something exists?	Jul 31, 2018
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