Web developer specializing in React, Vue, and front end development.
To create an empty list in Python with certain size, we can use the * operator.
For instance, we write:
l = [None] * 10
print(l)
We create a list with 10 None entries with [None] * 10.
Therefore, l is [None, None, None, None, None, None, None, None, None, None].
Sometimes, we want to get the full path of the current file’s directory with Python.
In this article, we’ll look at how to get the full path of the current file’s directory with Python.
To get the full path of the current file’s directory with Python, we can use the pathlib module.
To get the directory of the script being run, we write:
import pathlib
p = pathlib.Path(__file__).parent.resolve()
print(p)
Then p is something like '/home/runner/ShockingRosyGui'.
To get the current working directory, we write:
import pathlib
p = pathlib.Path().resolve()
print(p)
We call resolve on the Path instance to return the current working directory.
To get the full path of the current file’s directory with Python, we can use the pathlib module.
Sometimes, we want to find an item in a list in Python.
In this article, we’ll look at how to find an item in a list in Python.
To find an item in a list in Python, we can use list comprehension.
For instance, we write:
lst = [1, 2, 3, 4, 5, 6, 7, 8, 9]
matches = [x for x in lst if x > 6]
print(matches)
to return all the entries in lst that are bigger than 6.
We specify the condition of the items to include with the returned list with if x > 6.
And we specify the list to filter with x for x in lst.
Therefore, matches is [7, 8, 9].
To find an item in a list in Python, we can use list comprehension.
Sometimes, we want to format floats without trailing zeros with Python.
In this article, we’ll look at how to format floats without trailing zeros with Python.
To format floats without trailing zeros with Python, we can use the rstrip method.
For instance, we write:
x = 3.14000
n = ('%f' % x).rstrip('0').rstrip('.')
print(n)
We interpolate x into a string and then call rstrip with 0 and '.' to remove trailing zeroes from the number strings.
Therefore, n is 3.14.
To format floats without trailing zeros with Python, we can use the rstrip method.
Sometimes, we want to tail a log file in Python.
In this article, we’ll look at how to tail a log file in Python.
To tail a log file in Python, we can run tail with the sh module.
For instance, we write:
from sh import tail
for line in tail("-f", "foo.txt", _iter=True):
print(line)
We call tail with the file name and _iter set to True to let us run an infinite loop and print out line which has the output.
To tail a log file in Python, we can run tail with the sh module.