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StringIO It implements a file-like class that reads and writes a string buffer (also known as memory files). For example, there is src.csv file.src.csv 20,4050,9077,22 Run this code that read csv file.def execute(f): result = [] reader = csv.reader(f) for line in reader: one = int(line[0]) two = int(line[1]) three = one+two line.append(three) result.ap..

cv2.imread cv2.imread(fileName, flag) filename: The path to the image file. flag: The flag specifies the way how the image should be read, there are 3 options. - cv2.IMREAD_COLOR – It specifies to load a color image. Any transparency of image will be neglected, default. Alternatively, we can pass integer value 1. - cv2.IMREAD_GRAYSCALE – It specifies to load an image in grayscale mode. Alternati..

argparse When there is a Python script called run.py , we can run the file at the command prompt as follows. $ ./run.py If you want your Python script to work differently depending on the options, you'll need to get these arguments through the command line such as below. $ ./run.py -d 1 -f It must parse the arguments(ex, '-d', '-f') of the command line entered by the user, and then perform appro..

logging Logging is a means of tracking events that happen when some software runs. The software’s developer adds logging calls to their code to indicate that certain events have occurred. An event is described by a descriptive message which can optionally contain variable data (i.e. data that is potentially different for each occurrence of the event). Log Levels The log has a level one of these ..

repr It returns the string wrapped with ('). >>> a = "Life is too short" >>> str(a) 'Life is too short' >>> repr(a) "'Life is too short'" >>> import datetime >>> a = datetime.datetime(2017, 9, 27) >>> str(a) '2017-09-27 00:00:00' >>> repr(a) 'datetime.datetime(2017, 9, 27, 0, 0)' str repr -human-readable -informal -called by the built-in print(), str() -intended for users -more information-rich ..