hacktricks/generic-methodologies-and-resources/python/basic-python.md

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# Osnove Pythona
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{% hint style="success" %}
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{% endhint %}
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## Osnove Pythona
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### Korisne informacije
list(xrange()) == range() --> U python3, range je xrange u python2 (nije lista već generator)\
Razlika između Tuple i Liste je u tome što pozicija vrednosti u tuple-u daje značenje, dok su liste samo uređene vrednosti. Tuple imaju strukturu, dok liste imaju redosled.
### Osnovne operacije
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Za stepenovanje broja koristite: 3\*\*2 (ne 3^2)\
Ako uradite 2/3, vraća 1 jer delite dva cela broja (integers). Ako želite decimale, treba da delite float-ove (2.0/3.0).\
i >= j\
i <= j\
i == j\
i != j\
a and b\
a or b\
not a\
float(a)\
int(a)\
str(d)\
ord("A") = 65\
chr(65) = 'A'\
hex(100) = '0x64'\
hex(100)\[2:] = '64'\
isinstance(1, int) = True\
"a b".split(" ") = \['a', 'b']\
" ".join(\['a', 'b']) = "a b"\
"abcdef".startswith("ab") = True\
"abcdef".contains("abc") = True\
"abc\n".strip() = "abc"\
"apbc".replace("p","") = "abc"\
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dir(str) = Lista svih dostupnih metoda\
help(str) = Definicija klase str\
"a".upper() = "A"\
"A".lower() = "a"\
"abc".capitalize() = "Abc"\
sum(\[1,2,3]) = 6\
sorted(\[1,43,5,3,21,4])
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**Spajanje karaktera**\
3 \* a = aaa\
a + b = ab\
a + str(3) = a3\
\[1,2,3]+\[4,5]=\[1,2,3,4,5]
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**Delovi liste**\
abc\[0] = a\
'abc\[-1] = c\
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'abc\[1:3] = bc od \[1] do \[2]\
"qwertyuiop"\[:-1] = 'qwertyuio'
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**Komentari**\
\# Komentar u jednoj liniji\
"""\
Komentar u više linija\
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Još jedan\
"""
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**Petlje**
```
if a:
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#somethig
elif b:
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#something
else:
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#something
while(a):
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#comething
for i in range(0,100):
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#something from 0 to 99
for letter in "hola":
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#something with a letter in "hola"
```
### Tuple
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t1 = (1, '2', 'tri')\
t2 = (5, 6)\
t3 = t1 + t2 = (1, '2', 'tri', 5, 6)\
(4,) = Singlton\
d = () prazan tuple\
d += (4,) --> Dodavanje u tuple\
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NE MOŽE! --> t1\[1] == 'Nova vrednost'\
list(t2) = \[5, 6] --> Iz tuple u listu
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### Lista (niz)
d = \[] prazan\
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a = \[1, 2, 3]\
b = \[4, 5]\
a + b = \[1, 2, 3, 4, 5]\
b.append(6) = \[4, 5, 6]\
tuple(a) = (1, 2, 3) --> Iz liste u tuple
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### Rečnik
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d = {} prazan\
monthNumbers={1:'Jan', 2: 'feb','feb':2}—> monthNumbers ->{1:'Jan', 2: 'feb','feb':2}\
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monthNumbers\[1] = 'Jan'\
monthNumbers\['feb'] = 2\
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list(monthNumbers) = \[1, 2, 'feb']\
monthNumbers.values() = \['Jan', 'feb', 2]\
keys = \[k for k in monthNumbers]\
a={'9':9}\
monthNumbers.update(a) = {'9':9, 1:'Jan', 2: 'feb','feb':2}\
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mN = monthNumbers.copy() #Nezavisna kopija\
monthNumbers.get('ključ',0) #Provera da li ključ postoji, Vraća vrednost monthNumbers\["ključ"] ili 0 ako ne postoji
### Skup
U skupovima nema ponavljanja\
myset = set(\['a', 'b']) = {'a', 'b'}\
myset.add('c') = {'a', 'b', 'c'}\
myset.add('a') = {'a', 'b', 'c'} #Bez ponavljanja\
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myset.update(\[1, 2, 3]) = set(\['a', 1, 2, 'b', 'c', 3])\
myset.discard(10) #Ako je prisutno, ukloni, ako nije, ništa\
myset.remove(10) #Ako je prisutno, ukloni, ako nije, podiže izuzetak\
myset2 = set(\[1, 2, 3, 4])\
myset.union(myset2) #Vrednosti u myset ILI myset2\
myset.intersection(myset2) #Vrednosti u myset I myset2\
myset.difference(myset2) #Vrednosti u myset ali ne i u myset2\
myset.symmetric\_difference(myset2) #Vrednosti koje nisu ni u myset NI myset2 (nisu u oba)\
myset.pop() #Dobijanje prvog elementa skupa i uklanjanje\
myset.intersection\_update(myset2) #myset = Elementi u oba myset i myset2\
myset.difference\_update(myset2) #myset = Elementi u myset ali ne i u myset2\
myset.symmetric\_difference\_update(myset2) #myset = Elementi koji nisu u oba
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### Klase
Metod u \_\_It\_\_ će biti korišćen od strane sortiranja za poređenje da li je objekat ove klase veći od drugog
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```python
class Person(name):
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def __init__(self,name):
self.name= name
self.lastName = name.split( )[-1]
self.birthday = None
def __It__(self, other):
if self.lastName == other.lastName:
return self.name < other.name
return self.lastName < other.lastName #Return True if the lastname is smaller
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def setBirthday(self, month, day. year):
self.birthday = date tame.date(year,month,day)
def getAge(self):
return (date time.date.today() - self.birthday).days
class MITPerson(Person):
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nextIdNum = 0 # Attribute of the Class
def __init__(self, name):
Person.__init__(self,name)
self.idNum = MITPerson.nextIdNum —> Accedemos al atributo de la clase
MITPerson.nextIdNum += 1 #Attribute of the class +1
def __it__(self, other):
return self.idNum < other.idNum
```
### map, zip, filter, lambda, sorted i jednolinijski izrazi
**Map** je kao: \[f(x) for x in iterable] --> map(tutple,\[a,b]) = \[(1,2,3),(4,5)]\
m = map(lambda x: x % 3 == 0, \[1, 2, 3, 4, 5, 6, 7, 8, 9]) --> \[False, False, True, False, False, True, False, False, True]
**Zip** se zaustavlja kada se kraći od foo ili bar zaustavi:
```
for f, b in zip(foo, bar):
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print(f, b)
```
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**Lambda** se koristi za definisanje funkcije\
(lambda x,y: x+y)(5,3) = 8 --> Koristite lambda kao jednostavnu **funkciju**\
**sorted**(range(-5,6), key=lambda x: x\*\* 2) = \[0, -1, 1, -2, 2, -3, 3, -4, 4, -5, 5] --> Koristite lambda za sortiranje liste\
m = **filter**(lambda x: x % 3 == 0, \[1, 2, 3, 4, 5, 6, 7, 8, 9]) = \[3, 6, 9] --> Koristite lambda za filtriranje\
**reduce** (lambda x,y: x\*y, \[1,2,3,4]) = 24
```
def make_adder(n):
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return lambda x: x+n
plus3 = make_adder(3)
plus3(4) = 7 # 3 + 4 = 7
class Car:
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crash = lambda self: print('Boom!')
my_car = Car(); my_car.crash() = 'Boom!'
```
mult1 = \[x for x in \[1, 2, 3, 4, 5, 6, 7, 8, 9] if x%3 == 0 ]
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### Izuzeci
```
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def divide(x,y):
try:
result = x/y
except ZeroDivisionError, e:
print “division by zero!” + str(e)
except TypeError:
divide(int(x),int(y))
else:
print “result i”, result
finally
print “executing finally clause in any case”
```
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### Assert()
Ako je uslov netačan, string će biti prikazan na ekranu
```
def avg(grades, weights):
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assert not len(grades) == 0, 'no grades data'
assert len(grades) == 'wrong number grades'
```
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### Generatori, yield
Generator umesto vraćanja nečega, "daje" nešto. Kada mu pristupite, "vratit će" prvu generisanu vrednost, zatim možete ponovo pristupiti i dobiti sledeću generisanu vrednost. Dakle, sve vrednosti nisu generisane istovremeno i mnogo memorije može biti ušteđeno koristeći ovo umesto liste sa svim vrednostima.
```
def myGen(n):
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yield n
yield n + 1
```
g = myGen(6) --> 6\
next(g) --> 7\
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next(g) --> Greška
### Redovni izrazi
import re\
re.search("\w","hola").group() = "h"\
re.findall("\w","hola") = \['h', 'o', 'l', 'a']\
re.findall("\w+(la)","hola caracola") = \['la', 'la']
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**Posebna značenja:**\
. --> Sve\
\w --> \[a-zA-Z0-9\_]\
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\d --> Broj\
\s --> Beli znak\[ \n\r\t\f]\
\S --> Znak koji nije beli znak\
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^ --> Počinje sa\
$ --> Završava se sa\
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\+ --> Jedan ili više\
\* --> 0 ili više\
? --> 0 ili 1 pojavljivanje
**Opcije:**\
re.search(pat,str,re.IGNORECASE)\
IGNORECASE\
DOTALL --> Dozvoljava tački da se poklapa sa novim redom\
MULTILINE --> Dozvoljava ^ i $ da se poklapaju u različitim redovima
re.findall("<.\*>", "\<b>foo\</b>and\<i>so on\</i>") = \['\<b>foo\</b>and\<i>so on\</i>']\
re.findall("<.\*?>", "\<b>foo\</b>and\<i>so on\</i>") = \['\<b>', '\</b>', '\<i>', '\</i>']
IterTools\
**product**\
from **itertools** import product --> Generiše kombinacije između 1 ili više lista, možda ponavljajući vrednosti, kartezijev proizvod (distributivno svojstvo)\
print list(**product**(\[1,2,3],\[3,4])) = \[(1, 3), (1, 4), (2, 3), (2, 4), (3, 3), (3, 4)]\
print list(**product**(\[1,2,3],repeat = 2)) = \[(1, 1), (1, 2), (1, 3), (2, 1), (2, 2), (2, 3), (3, 1), (3, 2), (3, 3)]
**permutations**\
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from **itertools** import **permutations** --> Generiše kombinacije svih karaktera na svakoj poziciji\
print list(permutations(\['1','2','3'])) = \[('1', '2', '3'), ('1', '3', '2'), ('2', '1', '3'),... Svaka moguća kombinacija\
print(list(permutations('123',2))) = \[('1', '2'), ('1', '3'), ('2', '1'), ('2', '3'), ('3', '1'), ('3', '2')] Svaka moguća kombinacija dužine 2
**combinations**\
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from itertools import **combinations** --> Generiše sve moguće kombinacije bez ponavljanja karaktera (ako postoji "ab", ne generiše "ba")\
print(list(**combinations**('123',2))) --> \[('1', '2'), ('1', '3'), ('2', '3')]
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**combinations\_with\_replacement**\
from itertools import **combinations\_with\_replacement** --> Generiše sve moguće kombinacije od karaktera nadalje (na primer, 3. je mešan od 3. nadalje ali ne sa 2. ili 1.)\
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print(list(**combinations\_with\_replacement**('1133',2))) = \[('1', '1'), ('1', '1'), ('1', '3'), ('1', '3'), ('1', '1'), ('1', '3'), ('1', '3'), ('3', '3'), ('3', '3'), ('3', '3')]
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### Dekoratori
Dekorator koji meri vreme potrebno za izvršavanje funkcije (od [ovde](https://towardsdatascience.com/decorating-functions-in-python-619cbbe82c74)):
```python
from functools import wraps
import time
def timeme(func):
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@wraps(func)
def wrapper(*args, **kwargs):
print("Let's call our decorated function")
start = time.time()
result = func(*args, **kwargs)
print('Execution time: {} seconds'.format(time.time() - start))
return result
return wrapper
@timeme
def decorated_func():
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print("Decorated func!")
```
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Ako ga pokrenete, videćete nešto slično sledećem:
```
Let's call our decorated function
Decorated func!
Execution time: 4.792213439941406e-05 seconds
```
{% hint style="success" %}
Učite i vežbajte hakovanje AWS-a: <img src="/.gitbook/assets/arte.png" alt="" data-size="line">[**HackTricks Training AWS Red Team Expert (ARTE)**](https://training.hacktricks.xyz/courses/arte)<img src="/.gitbook/assets/arte.png" alt="" data-size="line">\
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<details>
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<summary>Podržite HackTricks</summary>
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* Proverite [**planove pretplate**](https://github.com/sponsors/carlospolop)!
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* **Delite hakovanje trikova slanjem PR-ova na** [**HackTricks**](https://github.com/carlospolop/hacktricks) i [**HackTricks Cloud**](https://github.com/carlospolop/hacktricks-cloud) github repozitorijume.
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</details>
{% endhint %}