<s>
Pip	B-Application
is	O
a	O
package-management	B-Application
system	I-Application
written	O
in	O
Python	B-Language
and	O
is	O
used	O
to	O
install	O
and	O
manage	O
software	B-Application
packages	I-Application
.	O
</s>
<s>
The	O
Python	B-Application
Software	I-Application
Foundation	I-Application
recommends	O
using	O
pip	B-Application
for	O
installing	O
Python	B-Language
applications	O
and	O
its	O
dependencies	O
during	O
deployment	O
.	O
</s>
<s>
Pip	B-Application
connects	O
to	O
an	O
online	B-Application
repository	I-Application
of	O
public	O
packages	O
,	O
called	O
the	O
Python	B-Language
Package	I-Language
Index	I-Language
.	O
</s>
<s>
Pip	B-Application
can	O
be	O
configured	O
to	O
connect	O
to	O
other	O
package	B-Application
repositories	I-Application
(	O
local	O
or	O
remote	O
)	O
,	O
provided	O
that	O
they	O
comply	O
to	O
Python	B-Language
Enhancement	O
Proposal	O
503	O
.	O
</s>
<s>
Most	O
distributions	O
of	O
Python	B-Language
come	O
with	O
pip	B-Application
preinstalled	O
.	O
</s>
<s>
Python	B-Language
2.7.9	O
and	O
later	O
(	O
on	O
the	O
python2	O
series	O
)	O
,	O
and	O
Python	B-Language
3.4	O
and	O
later	O
include	O
pip	B-Application
by	O
default	O
.	O
</s>
<s>
First	O
introduced	O
as	O
pyinstall	B-Application
in	O
2008	O
by	O
Ian	O
Bicking	O
(	O
the	O
creator	O
of	O
the	O
virtualenv	O
package	O
)	O
as	O
an	O
alternative	O
to	O
easy	O
install	O
,	O
pip	B-Application
was	O
chosen	O
as	O
the	O
new	O
name	O
from	O
one	O
of	O
several	O
suggestions	O
that	O
the	O
creator	O
received	O
on	O
his	O
blog	O
post	O
.	O
</s>
<s>
According	O
to	O
Bicking	O
himself	O
,	O
the	O
name	O
is	O
a	O
recursive	O
acronym	O
for	O
"	O
Pip	B-Application
Installs	O
Packages	O
"	O
.	O
</s>
<s>
In	O
2011	O
,	O
the	O
Python	B-Language
Packaging	O
Authority	O
(	O
PyPA	O
)	O
was	O
created	O
to	O
take	O
over	O
the	O
maintenance	O
of	O
pip	B-Application
and	O
virtualenv	O
from	O
Bicking	O
,	O
led	O
by	O
Carl	O
Meyer	O
,	O
Brian	O
Rosner	O
,	O
and	O
Jannis	O
Leidel	O
.	O
</s>
<s>
With	O
the	O
release	O
of	O
pip	B-Application
version	O
6.0	O
(	O
2014-12-22	O
)	O
,	O
the	O
version	O
naming	O
process	O
was	O
changed	O
to	O
have	O
version	O
in	O
X.Y	O
format	O
and	O
drop	O
the	O
preceding	O
1	O
from	O
the	O
version	O
label	O
.	O
</s>
<s>
Pip	B-Application
's	O
command-line	B-Application
interface	I-Application
allows	O
the	O
install	O
of	O
Python	B-Language
software	B-Application
packages	I-Application
by	O
issuing	O
a	O
command	O
:	O
</s>
<s>
Pip	B-Application
has	O
a	O
feature	O
to	O
manage	O
full	O
lists	O
of	O
packages	O
and	O
corresponding	O
version	O
numbers	O
,	O
possible	O
through	O
a	O
"	O
requirements	O
"	O
file	O
.	O
</s>
<s>
another	O
computer	O
)	O
or	O
virtual	B-General_Concept
environment	I-General_Concept
.	O
</s>
<s>
To	O
install	O
some	O
package	O
for	O
a	O
specific	O
python	B-Language
version	O
,	O
pip	B-Application
provides	O
the	O
following	O
command	O
,	O
where	O
${version}	O
is	O
replaced	O
by	O
2	O
,	O
3	O
,	O
3.4	O
,	O
etc	O
.	O
</s>
<s>
Pip	B-Application
provides	O
a	O
way	O
to	O
install	O
user-defined	O
projects	O
locally	O
with	O
the	O
use	O
of	O
file	O
.	O
</s>
<s>
This	O
method	O
requires	O
the	O
python	B-Language
project	O
to	O
have	O
the	O
following	O
file	O
structure	O
:	O
</s>
<s>
├──	O
exampleproject/	O
Python	B-Language
package	I-Language
with	O
source	O
code	O
.	O
</s>
<s>
After	O
this	O
,	O
pip	B-Application
can	O
install	O
this	O
custom	O
project	O
by	O
running	O
the	O
following	O
command	O
,	O
from	O
the	O
project	O
root	O
directory	O
:	O
</s>
<s>
Besides	O
the	O
default	O
PyPI	B-Language
repository	O
,	O
Pip	B-Application
supports	O
custom	O
repositories	O
as	O
well	O
.	O
</s>
