Python add suffix / add prefix to strings in a list

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Method: Using the + operator + list comprehension

In this task, we simply add a string to the back or front position using the + operator, and list comprehension is used to iterate over all elements.

# Python3 code to demonstrate working of
# Append suffix / prefix to strings in list
# Using list comprehension + "+" operator

# initializing list
test_list = [’a’, ’b’, ’c’, ’d’]

# printing list
print("The original list : " + str(test_list))

# initializing append_str
append_str = ’gfg’

# Append suffix / prefix to strings in list
pre_res = [append_str + sub for sub in test_list]
suf_res = [sub + append_str for sub in test_list]

# Printing result
print("list after prefix addition : " + str(pre_res))
print("list after suffix addition : " + str(suf_res))

Output:

 The original list: [’a’, ’b’,’ c’, ’d’] list after prefix addition: [’ gfga’, ’gfgb’,’ gfgc’, ’gfgd’] list afterix addition: [’ agfg’, ’bgfg’,’ cgfg ’,’ dgfg’] 
Python add suffix add prefix

Python add_prefix

Python is a great language for data analysis, primarily because of the fantastic ecosystem of data-centric Python packages. Pandas is one such package and makes it much easier to import and analyze data.

Dataframe.add_prefix() can be used with both series and dataframes.

  • For series, row labels are prefixed.
  • For a DataFrame, the column labels are prefixed.

Syntax: DataFrame.add_prefix(prefix)

Parameters:
prefix : string

Returns: with_prefix: type of caller

Example #1: Prefix col_ in each columns in the dataframe

# importing pandas as pd
import pandas as pd

# Making data frame from the csv file
df = pd.read_csv("nba.csv")

# Printing the first 10 rows of the
# dataframe for visualization
df[:10]

Python add_prefix
# Using add_prefix() function
# to add ’col_’ in each column label
df = df.add_prefix(’col_’)

# Print the dataframe
df

Example #2: Using add_prefix() with Series in pandas

add_prefix() alters the row index labels in the case of series.

# importing pandas as pd
import pandas as pd

# Creating a Series
df = pd.Series([1, 2, 3, 4, 5, 10, 11, 21, 4])

# This will prefix ’Row_’ in
# each row of the series
df = df.add_prefix(’Row_’)

# Print the Series
df

Python add_prefix

Python add suffix / add prefix to strings in a list cos: Questions

cos

How do I install pip on macOS or OS X?

5 answers

I spent most of the day yesterday searching for a clear answer for installing pip (package manager for Python). I can"t find a good solution.

How do I install it?

1672

Answer #1

UPDATE (Jan 2019):

easy_install has been deprecated. Please use get-pip.py instead.


Old answer:

easy_install pip

If you need admin privileges to run this, try:

sudo easy_install pip

1672

Answer #2

⚡️ TL;DR — One line solution.

All you have to do is:

sudo easy_install pip

2019: ⚠️easy_install has been deprecated. Check Method #2 below for preferred installation!

Details:

⚡️ OK, I read the solutions given above, but here"s an EASY solution to install pip.

MacOS comes with Python installed. But to make sure that you have Python installed open the terminal and run the following command.

python --version

If this command returns a version number that means Python exists. Which also means that you already have access to easy_install considering you are using macOS/OSX.

ℹ️ Now, all you have to do is run the following command.

sudo easy_install pip

After that, pip will be installed and you"ll be able to use it for installing other packages.

Let me know if you have any problems installing pip this way.

Cheers!

P.S. I ended up blogging a post about it. QuickTip: How Do I Install pip on macOS or OS X?


✅ UPDATE (Jan 2019): METHOD #2: Two line solution —

easy_install has been deprecated. Please use get-pip.py instead.

First of all download the get-pip file

curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py

Now run this file to install pip

python get-pip.py

That should do it.

Another gif you said? Here ya go!

1672

Answer #3

You can install it through Homebrew on OS X. Why would you install Python with Homebrew?

The version of Python that ships with OS X is great for learning but it’s not good for development. The version shipped with OS X may be out of date from the official current Python release, which is considered the stable production version. (source)

Homebrew is something of a package manager for OS X. Find more details on the Homebrew page. Once Homebrew is installed, run the following to install the latest Python, Pip & Setuptools:

brew install python

Python add suffix / add prefix to strings in a list Python functions: Questions

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