Pip - Fatal error in launcher: Unable to create process using

 python - Pip - Fatal error in launcher: Unable to create process using '"' - Stack Overflow

This worked for me under Windows 10 x64:

Ensure that the Python directories are in the path, e.g.:

# Edit Environment variables so that variable "path" points to the new location.
# Insert these at the start of the list (or delete other Python directories), as Windows takes the first match it finds.
# Run the program "Edit the System Environment Variables".
# Or see Control Panel under "System Properties".
S:\Research\bin\Python375\Scripts\
S:\Research\bin\Python375\

Then:

python -m pip install --upgrade --force-reinstall pip

In my particular case, the error was caused by shifting the Python directory to a new location.

Python: pip install from git repo branch

 python - pip install from git repo branch - Stack Overflow

Prepend the url prefix git+ (See VCS Support):

pip install git+https://github.com/tangentlabs/django-oscar-paypal.git@issue/34/oscar-0.6

And specify the branch name without the leading /.

Difference between Positive SSL and Positive SSL Wildcard

 Positive SSL Vs. Positive SSL Wildcard Certificates (sectigostore.com)

There is one major difference between Positive SSL and Positive SSL Wildcard: Positive SSL is a single domain SSL certificate that covers just one primary domain (www and non-www version),  while Positive SSL Wildcard secures one primary domain and all its first level subdomains.

Positive SSL	Positive SSL Wildcard
mysite.com www.mysite.com	mysite.com www.mysite.com login.mysite.com blog.mysite.com mail.mysite.com and more: unlimited subdomains!

pip install -r requirements.txt

 

Although it doesn't really answers this specific question. Others got the same error message with this mistake.

For those who like me initial forgot the -r: Use pip install -r requirements.txt the -r is essential for the command.

The original answer:

https://stackoverflow.com/a/42876654/10093070

Python: Can't find model 'en_core_web_trf'. It doesn't seem to be a Python package or a valid path to a data directory

 Can't import en_core_web_trf: AttributeError: module 'spacy.lang.en' has no attribute '__all__' · Issue #6830 · explosion/spaCy (github.com)

https://github.com/explosion/spacy-models/releases/download/en_core_web_trf-3.1.0/en_core_web_trf-3.1.0-py3-none-any.whl (460.2 MB)

The following code was run:

!pip install snorkel spacy-nightly[transformers,cuda100] --pre

import spacy
import spacy_transformers

from spacy.cli import download
download("en_core_web_trf")

nlp = spacy.load("en_core_web_trf")

spacy.load only loads pipelines from a package name or local path – it doesn't download anything. That only happens in the download function/command. Under the hood, it delegates to pip install and installs the downloaded package in your Python environment. If the same package and version is already installed, the download will be skipped.

Getting started with the classic Jupyter Notebook

 Project Jupyter | Installing the Jupyter Software

Installation with mamba or conda

The classic notebook can be installed with mamba and conda:

mamba install -c conda-forge notebook

or

conda install -c conda-forge notebook

Installation with pip

If you use pip, you can install it with:

pip install notebook

Congratulations, you have installed Jupyter Notebook! To run the notebook, run the following command at the Terminal (Mac/Linux) or Command Prompt (Windows):

jupyter notebook

See Running the Notebook for more details.

No package letsencrypt available

 rhel - No package certbot available - Stack Overflow

No package letsencrypt available

yum install epel-release

Regex Python adding characters after a certain word

 Python regex - r prefix - Stack Overflow

Regex Python adding characters after a certain word - Stack Overflow

Use re.sub() to provide replacements, using a backreference to re-use matched text:

import re

text = re.sub(r'(get)', r'\1@', text)

The (..) parenthesis mark a group, which \1 refers to when specifying a replacement. So get is replaced by get@.

Demo:

>>> import re
>>> text = 'Do you get it yet?'
>>> re.sub(r'(get)', r'\1@', text)
'Do you get@ it yet?'

The pattern will match get anywhere in the string; if you need to limit it to whole words, add \b anchors:

text = re.sub(r'(\bget\b)', r'\1@', text)

Because \ begin escape sequences only when they are valid escape sequences.
>>> '\n'
'\n'
>>> r'\n'
'\\n'
>>> print '\n'


>>> print r'\n'
\n
>>> '\s'
'\\s'
>>> r'\s'
'\\s'
>>> print '\s'
\s
>>> print r'\s'
\s
Unless an 'r' or 'R' prefix is present, escape sequences in strings are interpreted according to rules similar to those used by Standard C. The recognized escape sequences are:
Escape Sequence   Meaning Notes
\newline  Ignored  
\\    Backslash (\)    
\'    Single quote (')     
\"    Double quote (")     
\a    ASCII Bell (BEL)     
\b    ASCII Backspace (BS)     
\f    ASCII Formfeed (FF)  
\n    ASCII Linefeed (LF)  
\N{name}  Character named name in the Unicode database (Unicode only)  
\r    ASCII Carriage Return (CR)   
\t    ASCII Horizontal Tab (TAB)   
\uxxxx    Character with 16-bit hex value xxxx (Unicode only) 
\Uxxxxxxxx    Character with 32-bit hex value xxxxxxxx (Unicode only) 
\v    ASCII Vertical Tab (VT)  
\ooo  Character with octal value ooo
\xhh  Character with hex value hh
Never rely on raw strings for path literals, as raw strings have some rather peculiar inner workings, known to have bitten people in the ass:
When an "r" or "R" prefix is present, a character following a backslash is included in the string without change, and all backslashes are left in the string. For example, the string literal r"\n" consists of two characters: a backslash and a lowercase "n". String quotes can be escaped with a backslash, but the backslash remains in the string; for example, r"\"" is a valid string literal consisting of two characters: a backslash and a double quote; r"\" is not a valid string literal (even a raw string cannot end in an odd number of backslashes). Specifically, a raw string cannot end in a single backslash (since the backslash would escape the following quote character). Note also that a single backslash followed by a newline is interpreted as those two characters as part of the string, not as a line continuation.
To better illustrate this last point:
>>> r'\'
SyntaxError: EOL while scanning string literal
>>> r'\''
"\\'"
>>> '\'
SyntaxError: EOL while scanning string literal
>>> '\''
"'"
>>> 
>>> r'\\'
'\\\\'
>>> '\\'
'\\'
>>> print r'\\'
\\
>>> print r'\'
SyntaxError: EOL while scanning string literal
>>> print '\\'
\

Python: The self Parameter

 Python Classes (w3schools.com)

The self parameter is a reference to the current instance of the class, and is used to access variables that belongs to the class.

It does not have to be named self , you can call it whatever you like, but it has to be the first parameter of any function in the class:

Example

Use the words mysillyobject and abc instead of self:

class Person:
  def __init__(mysillyobject, name, age):
    mysillyobject.name = name
    mysillyobject.age = age

  def myfunc(abc):
    print("Hello my name is " + abc.name)

p1 = Person("John", 36)
p1.myfunc()

Try it Yourself »

---

Python: Arbitrary Arguments, Arbitrary Keyword Arguments

 Python Functions (w3schools.com)

Arbitrary Arguments, *args

If you do not know how many arguments that will be passed into your function, add a * before the parameter name in the function definition.

This way the function will receive a tuple of arguments, and can access the items accordingly:

Example

If the number of arguments is unknown, add a * before the parameter name:

def my_function(*kids):
  print("The youngest child is " + kids[2])

my_function("Emil", "Tobias", "Linus")

Try it Yourself »

Arbitrary Arguments are often shortened to *args in Python documentations.

---

Keyword Arguments

You can also send arguments with the key = value syntax.

This way the order of the arguments does not matter.

Example

def my_function(child3, child2, child1):
  print("The youngest child is " + child3)

my_function(child1 = "Emil", child2 = "Tobias", child3 = "Linus")

Try it Yourself »

The phrase Keyword Arguments are often shortened to kwargs in Python documentations.

---

Arbitrary Keyword Arguments, **kwargs

If you do not know how many keyword arguments that will be passed into your function, add two asterisk: ** before the parameter name in the function definition.

This way the function will receive a dictionary of arguments, and can access the items accordingly:

Example

If the number of keyword arguments is unknown, add a double ** before the parameter name:

def my_function(**kid):
  print("His last name is " + kid["lname"])

my_function(fname = "Tobias", lname = "Refsnes")

Try it Yourself »

Arbitrary Kword Arguments are often shortened to **kwargs in Python documentations.

parameter and argument

 Python Functions (w3schools.com)

The terms parameter and argument can be used for the same thing: information that are passed into a function.

From a function's perspective:

A parameter is the variable listed inside the parentheses in the function definition.

An argument is the value that is sent to the function when it is called.

Python: isinstance() function

 Python Booleans (w3schools.com)

Python also has many built-in functions that return a boolean value, like the isinstance() function, which can be used to determine if an object is of a certain data type:

Example

Check if an object is an integer or not:

x = 200
print(isinstance(x, int))

Python: multiline string

 Python Strings (w3schools.com)

Or, not quite as intended, you can use a multiline string.

Since Python will ignore string literals that are not assigned to a variable, you can add a multiline string (triple quotes) in your code, and place your comment inside it:

Example

"""
This is a comment
written in
more than just one line
"""
print("Hello, World!")

Multiline Strings

You can assign a multiline string to a variable by using three quotes:

Example

You can use three double quotes:

a = """Lorem ipsum dolor sit amet,
consectetur adipiscing elit,
sed do eiusmod tempor incididunt
ut labore et dolore magna aliqua."""
print(a)

Strings are Arrays

Like many other popular programming languages, strings in Python are arrays of bytes representing unicode characters.

However, Python does not have a character data type, a single character is simply a string with a length of 1.

Square brackets can be used to access elements of the string.

Example

Get the character at position 1 (remember that the first character has the position 0):

a = "Hello, World!"
print(a[1])

Looping Through a String

Since strings are arrays, we can loop through the characters in a string, with a for loop.

Example

Loop through the letters in the word "banana":

for x in "banana":
  print(x)

Check String

To check if a certain phrase or character is present in a string, we can use the keyword in.

Example

Check if "free" is present in the following text:

txt = "The best things in life are free!"
print("free" in txt)

Use it in an if statement:

Example

Print only if "free" is present:

txt = "The best things in life are free!"
if "free" in txt:
  print("Yes, 'free' is present.")

Try it Yourself »

Learn more about If statements in our Python If...Else chapter.

---

Check if NOT

To check if a certain phrase or character is NOT present in a string, we can use the keyword not in.

Example

Check if "expensive" is NOT present in the following text:

txt = "The best things in life are free!"
print("expensive" not in txt)

Try it Yourself »

Use it in an if statement:

Example

print only if "expensive" is NOT present:

txt = "The best things in life are free!"
if "expensive" not in txt:
  print("No, 'expensive' is NOT present.")