19.11.2019 Python

>>> kier = {'krakow':12, 'gliwice':32}
>>> for k,v in kier:
    primn
KeyboardInterrupt
>>> for k,v in kier.items():
    print(k,v)


krakow 12
gliwice 32
>>> miasta = ['krakow', 'gliwice']
>>> knumery = [12, 32]
>>> for x, y in zip(miasta, knumery):
    print(x, y)


krakow 12
gliwice 32
>>> a = [23, 54, 213 , 54 , 65]
>>> for x in a:
    print(x)


23
54
213
54
65
>>> for x in reversed(a):
    print(x)


65
54
213
54
23
>>> for x in sorted(a):
    print(x)


23
54
54
65
213

---------------------------------------------


# pobieramy wyraz, obl liczbe wystapien znakow wyst w lancuchu

##def lett_freq(word):
##    freqs = dict()
##
##    for letter in word:
##        if not letter in freqs:
##            freqs[letter] = 0
##        freqs[letter] += 1
##
##    return freqs

def lett_freq(word):
    freqs = dict()

    for letter in word:
        if not letter in freqs:
            freqs[letter] = 1
        else:
            freqs[letter] += 1

    return freqs


word = input('Wpisz wyraz')

freqs = lett_freq(word)

for letter, occurences in freqs.items():
    print(letter, '->', occurences)
-----------------------------------
for letter, occurences in sorted(freqs.items()):
    print(letter, '->', occurences)
# To samo z listami i krotkami na zadanie!!!
-------------------------------------
# Słownik o różnych wartościach, chciałbym mieć funkcje ktora przyjmujac slownik pozwoli
# Zwrocic odwrocony slownik, klucze stana sie wartosciami a wartosci kluczami.

def reverse_dict(d):
##    result = dict()
##
##    for x, y in d.items():
##        result[y] = x
##    return result
    return { y:x for x, y in d.items() }

d = { 2:4, 3:9, 4:16, 5:25 }

print(reverse_dict(d))
--------------------------------------------

>>> x = set()
>>> x.add('asdas')
>>> x.add(123)
>>> x
{'asdas', 123}
>>> x.add([123])
Traceback (most recent call last):
  File "<pyshell#25>", line 1, in <module>
    x.add([123])
TypeError: unhashable type: 'list'
>>> x.add({'123'})
Traceback (most recent call last):
  File "<pyshell#26>", line 1, in <module>
    x.add({'123'})
TypeError: unhashable type: 'set'
>>> x.add({1:2})
Traceback (most recent call last):
  File "<pyshell#27>", line 1, in <module>
    x.add({1:2})
TypeError: unhashable type: 'dict'
>>> y = dict()
>>> y[{1:2}] = 1
Traceback (most recent call last):
  File "<pyshell#29>", line 1, in <module>
    y[{1:2}] = 1
TypeError: unhashable type: 'dict'
>>> y[1] = {1:2}
>>> y[0] = [1,2]
>>> y[2] = {'1', '2'}
>>> x.add((1,3))
>>> s.add((12, [3]))
Traceback (most recent call last):
  File "<pyshell#34>", line 1, in <module>
    s.add((12, [3]))
NameError: name 's' is not defined
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