#python 3.5

Hello friends, AI Sangam (Best Python Company) brings a simple but understandable document on installing virtual environment for python 2.7 and python 3.5. VIrtual environment helps you a lot while running different projects because your files in /usr/local/lib/python remains unaffected and packages are installed in the virtual environment only. Please spare some time to see this document

http://www.python.tc/python-3-5-0-ile-nasil-twitter-botu-yapilir/

Python 3.5.0 ile Nasil Twitter Botu Yapılır?

Python 3.5.0 ile Nasil Twitter Botu Yapılır?

Problem 1: Splicing strings

Write a Python program that reads from standard input a long string S and outputs four new strings:

S2 only contains the last two letters of S

S3 only contains the first two letters of S

S4 only contains the 2nd, 4th, and 6th letter of S

S5 contains the first three AND last three letters of S

You will always assume that S contains more than 6 letters.

Problem 2: Encryption

Write a Python program that reads in a string S and an integer number N and encripts S based on N

The process of encryption is

Step 1: reverse the first N characters of S

Step 2: reverse the last N characters of S

Note that it is important that the two steps are performed in that order. We will assume that N is smaller than the length of the string S.

Examples of encryption:

The string "This is a test" with the key N=4 is encrypted to "sihT is a tset"

The string "Another example" with the key N=2 is ecnrypted to "nAother exampel"

Problem 3: Computing change

Write a Python program that reads in a change amount (assumed to be between 0 and 99 cents) and computes the minimal number of coins needed to tend this change.

For example, if the change amounts is 82 cents, the output of your program should look like:

Yay, another story of a package which surprisingly fails to install! :)

Let’s break it down:

Part 1 (Problem): Installing httpretty

> sudo pip3.5 install gensim

Collecting gensim

[...]

Collecting httpretty==0.8.6 (from smart-open>=1.2.1->gensim)

Using cached httpretty-0.8.6.tar.gz

   Complete output from command python setup.py egg_info:

   Traceback (most recent call last):

[...]

File "/usr/lib/python3.5/encodings/ascii.py", line 26, in decode

return codecs.ascii_decode(input, self.errors)[0]

UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 133: ordinal not in range(128)

Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-build-wwjm5awu/httpretty

An classic example of an UnicodeDecodeError. Such a rare encounter in the wild... Oh, how nice would that be ;)

Part 1 (Fix): Changing the system-locale

Obviously there is a problem with the locale, so let’s find out what it’s set to

> locale

LANG= LANGUAGE=                          LC_CTYPE="POSIX"                                LC_NUMERIC="POSIX" LC_TIME="POSIX" LC_COLLATE="POSIX" LC_MONETARY="POSIX" LC_MESSAGES="POSIX" LC_PAPER="POSIX" LC_NAME="POSIX" LC_ADDRESS="POSIX" LC_TELEPHONE="POSIX" LC_MEASUREMENT="POSIX" LC_IDENTIFICATION="POSIX" LC_ALL=

Seems like an ASCII-locale is used. We need to find a replacement for that, so list all currently installed locales

> locale -a C C.UTF-8 en_US.utf8 POSIX

Wow, a perfect opportunity! Let’s use that smexy UTF-8 locale :)

> update-locale LC_ALL=en_US.utf8

Now log out and back in. It should successfully install httpretty now. For me, SciPy failed to install, too, so there we go:

Part 2 (Problem): Installing SciPy

> sudo pip3.5 install gensim      

Collecting gensim

[...]

Atlas (http://math-atlas.sourceforge.net/) libraries not found. [...]

Lapack (http://www.netlib.org/lapack/) libraries not found. [...]

Lapack (http://www.netlib.org/lapack/) sources not found. [...]

numpy.distutils.system_info.NotFoundError: no lapack/blas resources found [...]

Failed building wheel for scipy

[...]

Successfully built gensim smart-open httpretty bz2file

Failed to build scipy

Installing collected packages: scipy, boto, httpretty, bz2file, smart-open, gensim

Running setup.py install for scipy

[...]

numpy.distutils.system_info.NotFoundError: no lapack/blas resources found   

----------------------------------------

Command "/usr/bin/python3.5 -c "import setuptools, tokenize;__file__='/tmp/pip-build-j601bm8w/scipy/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /tmp/pip-4_fhi6ho-record/install-record.txt --single-version-externally-managed --compile" failed with error code 1 in /tmp/pip-build-j601bm8w/scipy

Part 2 (Fix): Installing packages for BLAS and LAPACK

Somehow I couldn’t get these instructions to work, so I went with these:

> sudo apt-get install gfortran libopenblas-dev liblapack-dev

Now the Installation worked like a charm.

Summary

The pip-package gensim failed to install because of the dependency httpretty trying to print to a non-UTF-8 locale and the dependency SciPy failing to find OpenBLAS/Lapack-Libraries.