ahmedazizkhelifi

users_name3 =[user['name'] for user in Users if user['name'][0]=="A"]
print(users_name3) #>>> ['Ahmed', 'Aziz']

ahmedazizkhelifi

Users= [
    {'id' : 0, 'name' : 'Ahmed', 'salary' : 1200},
    {'id' : 1, 'name' : 'Aziz', 'salary' : 1800},
    {'id' : 2, 'name' : 'Khelifi', 'salary' : 820}
]

#conventional syntax:
users_name=[]
for user in Users:
    users_name.append(user['name'])

ahmedazizkhelifi

L= [0,1,2,3,4,5,6,7,8,9]
def condition(x):
    return x>4
L2 = list(filter(condition,L))
# >>> [5, 6, 7, 8, 9]

L3 = list(filter(lambda x : x > 4 , L ))
# >>> [5, 6, 7, 8, 9]

import numpy as np 

ahmedazizkhelifi

def add_def(x,y):
    return x+y
add_lambda = lambda x,y : x+y
add_def(5,3) # >>> 8
add_lambda(5,3) # >>> 8 

ahmedazizkhelifi

def maxi(a,b):
    return max(a,b)
print(maxi(1,2))
print(maxi(1,a)) #>> NameError: name 'a' is not defined

ahmedazizkhelifi

def maxi(a,b):
    return max(a,b)
import pdb
pdb.set_trace()
print(maxi(1,2))
print(maxi(1,a))

ahmedazizkhelifi

$$
\frac{arg 1}{arg 2} \\
x^2\\
e^{i\pi}\\
A_i\\
B_{ij}\\
\sqrt[n]{arg}	
$$

ahmedazizkhelifi

#Other Symbols
## Angles:
Left angle : $\langle$

Right angle : $\rangle$

Angle between two vectors u and v	: $\langle \vec{u},\vec{v}\rangle$	

$$ \vec{AB} \, \cdot \, \vec{CD} =0  \Rightarrow  \vec{AB} \, \perp\, \vec{CD}$$

ahmedazizkhelifi

$$
\sin(-\alpha)=-\sin(\alpha)\\
\arccos(x)=\arcsin(u)\\
\log_n(n)=1\\
\tan(x) = \frac{\sin(x)}{\cos(x)}
$$

ahmedazizkhelifi

Given : $\pi = 3.14$ , $\alpha = \frac{3\pi}{4}\, rad$
$$
\omega = 2\pi f \\
f = \frac{c}{\lambda}\\
\lambda_0=\theta^2+\delta\\
\Delta\lambda = \frac{1}{\lambda^2}
$$