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Rajendra Dharmkar has Published 189 Articles

Rajendra Dharmkar
304 Views
Attributes of a classEverything, almost everything in Python is an object. Every object has attributes and methods. Thus attributes are very fundamental in Python. A class is a construct which is a collection of similar objects. A class also has attributes. There will be a difference between the class attributes ... Read More

Rajendra Dharmkar
29K+ Views
The io module is now recommended and is compatible with Python 3's open syntax: The following code is used to read and write to unicode(UTF-8) files in PythonExampleimport io with io.open(filename, 'r', encoding='utf8') as f: text = f.read() # process Unicode text with io.open(filename, 'w', encoding='utf8') as f: ... Read More

Rajendra Dharmkar
3K+ Views
The following code using Python regex matches the given multiple words in the given stringExampleimport re s = "These are roses and lilies and orchids, but not marigolds or .." r = re.compile(r'\broses\b | \bmarigolds\b | \borchids\b', flags=re.I | re.X) print r.findall(s)OutputThis gives the output['roses', 'orchids', 'marigolds']Read More

Rajendra Dharmkar
434 Views
The following code does the replacement in the given text file. After the replacement, the text is written to a new text file 'bar.txt'Examplef1 = open('foo.txt', 'r') f2 = open('bar.txt', 'w') for line in f1: print line f2.write(line.replace('Poetry', 'Prose')) f2 = open('bar.txt', 'r') for line in f2: ... Read More

Rajendra Dharmkar
269 Views
There are many modules available in both the standard library and the PiPy repository for date manipulation. The most popular among these libraries are the following(in no particular order) −datetime (Standard library) − The datetime module supplies classes for manipulating dates and times in both simple and complex ways. While ... Read More

Rajendra Dharmkar
938 Views
You can get the Python date object for last wednesday using some Python date math. Whatever the day of the week it is today, subtracting 2 from it and taking the modulus of the result by 7 will give us how back was wedenesday. examplefrom datetime import date from datetime import ... Read More

Rajendra Dharmkar
2K+ Views
To measure time of a program's execution, either use time.clock() or time.time() functions. The python docs state that this function should be used for benchmarking purposes. exampleimport time t0= time.clock() print("Hello") t1 = time.clock() - t0 print("Time elapsed: ", t1 - t0) # CPU seconds elapsed (floating point)OutputThis will give the ... Read More

Rajendra Dharmkar
3K+ Views
To find out if 24 hrs have passed between datetimes in Python, you will need to do some date math in Python. So if you have 2 datetime objects, you'll have to subtract them and then take the timedelta object you get as a result and use if for comparision. ... Read More

Rajendra Dharmkar
253 Views
% can either take a variable or a tuple. So you'd have to be very explicit about what you want it to do. For example, if you try formatting such that −Examplemy_tuple = (1, 2, 3) "My tuple: %s" % my_tuple You'd expect it to give the output: My tuple: ... Read More

Rajendra Dharmkar
1K+ Views
You can use the tempfile module to create a unique temporary directory in the most secure manner possible. There are no race conditions in the directory’s creation. The directory is readable, writable and searchable only by the creating user ID. Note that the user of mkdtemp() is responsible for deleting ... Read More