pyCreateDictionaries

sentence = "hello, this is a sentence"

# method 1 using get()
mydict= {}
for ch in sentence:
    ctr = mydict.get(ch, 0)
    mydict[ch] = ctr + 1
print(mydict)
# ------------------------

# method 2 not using get()
mydic2 = {}
for ch in sentence:
    if ch in mydic2:
        mydic2[ch] = 1 + mydic2[ch]
    else:
        mydic2[ch] = 1
print(mydic2)
# -------------------------)

# method 3 using set() and count()
mydic3 = {}
aset = set(sentence)
for ch in aset:
    ctr = sentence.count(ch)
    mydic3[ch] = ctr
print(mydic3)