Check String contains Substring Method
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#python 

if "blah" not in somestring: 
    continue

Create a nested directory in Python 3.5+
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#python 

import pathlib
pathlib.Path('/my/directory').mkdir(parents=True, exist_ok=True)
-1

How to list all files of a directory in Python
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#python 

import glob
print(glob.glob("/home/adam/*.txt"))

Check if a list is empty in Python
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#python 

a = []

if not a:
  print("List is empty")

Getting the index of an item in a list containing it in Python
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#python 

>>> ["foo", "bar", "baz"].index("bar")
1

Check if a key already exists in a dictionary
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#python 

if 'key1' in dict:
  print "blah"
else:
  print "boo"

Getting the index of 'for' loops
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#python 

for idx, val in enumerate(ints):
    print(idx, val)
-1

Put a time delay in a Python script
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#python 

import time
time.sleep(5)   # Delays for 5 seconds. You can also use a float value.

Get the current time in Python
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#python 

>>> from time import gmtime, strftime
>>> strftime("%Y-%m-%d %H:%M:%S", gmtime())
'2009-01-05 22:14:39'

Clone or copy a list in Python
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#python 

newlist = old_list.copy()

How to Parse a numeric string into a float or integer in Python
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#python 

>>> a = "545.2222"
>>> float(a)
545.22220000000004
>>> int(float(a))
545
1

Huber Loss in TensorFlow
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#python 

x = tf.random_normal([300], mean = 5, stddev = 1)
y = tf.random_normal([300], mean = 5, stddev = 1)
avg = tf.reduce_mean(x - y)
cond = tf.less(avg, 0)
left_op = tf.reduce_mean(tf.square(x-y))
right_op = tf.reduce_mean(tf.abs(x-y))
out = tf.where(cond, left_op, right_op) #tf.select() has been fucking deprecated
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