how to add a key to a dictionary? Eg: {0:10, 1:20} Expected output:{0:10, 1:20, 2:30}

Answer 1

d={}
d[1]=10
d[2]=20
d[3]=30
print(d)

or:

d={}
for i in range(1,4):
d[i]=i*10
print(d)

or:

d=dict((i,i*10) for i in range(1,4))
print(d)

Answer 2

add as in the math operator?

Answer 3

the range was just an example

the nice thing about python dictionary is that the key-value pair is added if the key does not exists already

if key does exists, then the value of it will be updated

d={} # create new empty dictionary
d["hello"]="world"
print(d)
{"hello": "world"}

d["foo"]="bar"
print(d)
{"hello": "world", "foo": "bar"}

d["hello"]=42 # updates value of key "hello"
print(d)
{"hello": 42, "foo": "bar"}

Answer 4

that not gonna work

dictionary works by assigning value to a key
dic={}
dic[0]=10 # this create a key-value pair in the dictionary where the key is whatever inside the [ ] and the value is on the right side of =

Answer 5

okay 👌 got it
thanks a lot😁

Answer 6

if use the add function？

Answer 7

can i just type it out？

Answer 8

and how about if the dictionary value is not in range？

Answer 9

so if i write like this is okay or not？
dic=｛｝
dic=｛0:10｝
dic=｛1:20｝
dic=｛2:30｝
print（dic）