Sometimes, we want to use execfile in Python 3.
In this article, we’ll look at how to use execfile in Python 3.
To use execfile in Python 3, we call exec.
For instance, we write
exec(open("./filename").read())
to open the ./filename file with open and read it with read.
And then we run the opened file with exec.
To use execfile in Python 3, we call exec.
Sometimes, we want to check for NaN values with Python.
In this article, we’ll look at how to check for NaN values with Python.
To check for NaN values with Python, we can use the math.isnan method.
For instance, we write
import math
x = float('nan')
is_nan = math.isnan(x)
to call math.isnan on x to check if x is NaN.
Since x is NaN, is_nan is True.
To check for NaN values with Python, we can use the math.isnan method.
Sometimes, we want to strip HTML from strings in Python.
In this article, we’ll look at how to strip HTML from strings in Python.
To strip HTML from strings in Python, we can create a subclass of the HTMLParser class.
For instance, we write
from io import StringIO
from html.parser import HTMLParser
class MLStripper(HTMLParser):
def __init__(self):
super().__init__()
self.reset()
self.strict = False
self.convert_charrefs= True
self.text = StringIO()
def handle_data(self, d):
self.text.write(d)
def get_data(self):
return self.text.getvalue()
def strip_tags(html):
s = MLStripper()
s.feed(html)
return s.get_data()
to create the MLStripper class.
In it, we call self.text.getvalue in the get_data method to return the HTML content without the tags.
And then in the strip_tags function, we create an MLStripper object.
We put the html in the object with feed to parse it.
And then we call s.get_data to return the parsed HTML without the tags.
To strip HTML from strings in Python, we can create a subclass of the HTMLParser class.
Sometimes, we want to properly ignore exceptions with Python.
In this article, we’ll look at how to properly ignore exceptions with Python.
To properly ignore exceptions with Python, we can use try-except.
For instance, we write
try:
f()
except:
pass
to call function f in the try block.
And any exceptions raised in f will be caught in the except block.
We just add pass in the except block to make it an empty block.
To properly ignore exceptions with Python, we can use try-except.
Sometimes, we want to add a text progress bar in terminal with block characters with Python.
In this article, we’ll look at how to add a text progress bar in terminal with block characters with Python.
To add a text progress bar in terminal with block characters with Python, we can use sys.stdout.write to write block characters to the screen.
For instance, we write
import time
import sys
for i in range(100):
time.sleep(1)
sys.stdout.write("\r%d%%" % i)
sys.stdout.flush()
to call sys.stdout.write to write the percentage number to the screen with "\r%d%%" % i.
And then we call flush to flush out the output.
To add a text progress bar in terminal with block characters with Python, we can use sys.stdout.write to write block characters to the screen.