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cheat.sheets/sheets/_python/loops
Marek Madejski b1abf6b7f3
'for else' fix
small logic and syntax fix
2018-07-27 22:07:45 +02:00

83 lines
1.1 KiB
Plaintext

# Basic conditional:
if x > 0:
print(x)
# 'if else'
if x > 0:
print(x)
else:
print(-x)
#ternary operator
parity = 'even' if x % 2 == 0 else 'odd'
'''
# Equivalent of:
if x % 2 == 0:
parity = 'even'
else:
parity = 'odd'
'''
# multiple conditions:
if x > 0:
print(x)
elif x == 0:
print(420)
elif x == 1:
print(421)
else:
print(-x)
# Basic 'for' loop:
for i in range(6):
print(i) #prints 0, 1, 2, 3, 4, 5
for i in range(2, 6):
print(i) #prints 2, 3, 4, 5
for i in range(3, 10, 2):
print(i) #prints 3, 5, 7, 9
# Iterating through collections:
for i in [0, 1, 1, 2, 3, 5]:
print(i) #prints 0, 1, 1, 2, 3, 5
for i in 'qwerty':
print(i) #prints q, w, e, r, t, y
# 'for else':
for i in x:
if i == 0:
break
else:
print('not found')
'''
# Equivalent of:
flag = False
for i in x:
if i == 0:
flag = True
break
if not flag:
print('not found')
'''
# Basic 'while' loop:
x = 0
while x < 6:
print(i)
x += 2
# prints 0, 2, 4
# No 'do while' loop in Python.
# Equivalent with 'while' loop:
x = 4
while True:
print(x)
x += 1
if x >= 4:
break
# prints 4