wiccy46

from math import gcd # Python versions 3.5 and above
#from fractions import gcd # Python versions below 3.5
from functools import reduce # Python version 3.x

def lcm(denominators):
    return reduce(lambda a,b: a*b // gcd(a,b), denominators)

wiccy46

1. saving a program's state data to disk so that it can carry on where it left off when restarted (persistence)

2. sending python data over a TCP connection in a multi-core or distributed system (marshalling)

3. storing python objects in a database

4. converting an arbitrary python object to a string so that it can be used as a dictionary key (e.g. for caching & memoization).

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def search_path(root):
	if root is None:
		return []
	
	if root.left is None and root.right is None:
		return [root.value]

	return [root.value + val for val in search_path(root.right) 
			+ search_path(root.left)]
  

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model = Sequential()

model.add(Dense(256, input_shape=(40, )))
model.add(Acitivation('relu'))
model.add(Dropout(0.5))

model.add(Dense(256))
model.add(Activation('relu'))
model.add(Dropout(0.5))

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def batch_generator(items, batch_size):
    batch = []
    i = 0
    for item in items:
        batch.append(item)
        if len(batch) == batch_size:
            yield batch
            batch = []
    yield batch

wiccy46

$ docker run -it --rm --name ds -p 8888:8888 jupyter/datescience-notebook

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import os
project_root = os.path.dirname(os.path.abspath(__file__))

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Step 1: In order to remove existing files from the repository:

find . -name .DS_Store -print0 | xargs -0 git rm -f --ignore-unmatch

Step 2: Add this line '.DS_Store' to your .gitignore file, which can be found at the top level of your repository (or create if it isn't there already. Use the following command to do so:

echo .DS_Store >> .gitignore

Step 3: Then run the following command: 

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from collections import defaultdict

item_list = 'spam spam egg egg spam'.split()
count = defaultdict(int)

for item in item_list:
  count[item] += 1
  
 

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n = 1234
rev=0
while(n>0):
    dig=n%10
    rev=rev*10+dig
    n=n//10