# Returns all the records as a list of Row df.collect() # [Row(age=2, name=u'Alice'), Row(age=5, name=u'Bob')]
Here is what the above code is Doing:
1. We create a DataFrame from a Python list of tuples.
2. We call the show() method to print the DataFrame.
3. We call the collect() method to return a list that contains all of the rows in this DataFrame.
min(range(len(a)), key=lambda i: abs(a[i]-11.5)) Here is what the above code is Doing: 1. range(len(a)) returns a list of indices of a. 2. key=lambda i: abs(a[i]-11.5) returns a function that takes an index i and returns the absolute value of the difference between a[i] and 11.5. 3. min(range(len(a)), key=lambda i: abs(a[i]-11.5)) returns the index of the…
In [47]: df.describe().transpose() Out[47]: count mean std min 25% 50% 75% max shopper_num 14 7.5 4.1833 1 4.25 7.5 10.75 14 is_martian 14 0 0 False 0 0 0 False number_of_items 14 3.357143 6.452276 0 0 0 3.5 22 count_pineapples 14 0 0 0 0 0 0 0 [4 rows x 8 columns] Here is…
>>> line = ‘1234567890’ >>> n = 2 >>> [line[i:i+n] for i in range(0, len(line), n)] [’12’, ’34’, ’56’, ’78’, ’90’] Here is what the above code is Doing: 1. We have a string, line, and a number, n. 2. We create a list comprehension that loops over the string, line. 3. We use the…
# function wrt to differentate def cu(x): return x*x*x # differentation function # Slightly increase x and compute the result. # Then compute the ratio of change in result with change in x def diff(fun, x): delta = 0.000000001 y = fun(x) x1 = x+delta y1 = fun(x1) return (y1-y) / (x1-x) # X^3 =…
np.where(A) Here is what the above code is Doing: 1. np.where(A) returns the indices of the elements of A that are non-zero. 2. The first element of the result is a list of row indices of the non-zero elements. 3. The second element of the result is a list of column indices of the non-zero…
cap.set(cv2.CAP_PROP_FRAME_WIDTH,640); cap.set(cv2.CAP_PROP_FRAME_HEIGHT,480); Here is what the above code is Doing: 1. We create a VideoCapture object. Its argument can be either the device index or the name of a video file. Device index is just the number to specify which camera. Normally one camera will be connected (as in my case). So I simply pass…