In [1]:

    

from decimal import Decimal, ROUND_HALF_UP, ROUND_HALF_EVEN


    

In [2]:

    

print(Decimal(0.05))


    

    




0.05000000000000000277555756156289135105907917022705078125

In [3]:

    

print(type(Decimal(0.05)))


    

    




<class 'decimal.Decimal'>

In [4]:

    

print(Decimal(0.5))


    

    




0.5

In [5]:

    

print(Decimal('0.05'))


    

    




0.05

In [6]:

    

f = 123.456


    

In [7]:

    

print(Decimal(str(f)).quantize(Decimal('0'), rounding=ROUND_HALF_UP))


    

    




123

In [8]:

    

print(Decimal(str(f)).quantize(Decimal('0.1'), rounding=ROUND_HALF_UP))


    

    




123.5

In [9]:

    

print(Decimal(str(f)).quantize(Decimal('0.01'), rounding=ROUND_HALF_UP))


    

    




123.46

In [10]:

    

print('0.4 =>', Decimal(str(0.4)).quantize(Decimal('0'), rounding=ROUND_HALF_UP))
print('0.5 =>', Decimal(str(0.5)).quantize(Decimal('0'), rounding=ROUND_HALF_UP))
print('0.6 =>', Decimal(str(0.6)).quantize(Decimal('0'), rounding=ROUND_HALF_UP))


    

    




0.4 => 0
0.5 => 1
0.6 => 1

In [11]:

    

print('0.05 =>', round(0.05, 1))
print('0.15 =>', round(0.15, 1))
print('0.25 =>', round(0.25, 1))
print('0.35 =>', round(0.35, 1))
print('0.45 =>', round(0.45, 1))


    

    




0.05 => 0.1
0.15 => 0.1
0.25 => 0.2
0.35 => 0.3
0.45 => 0.5

In [12]:

    

print('0.05 =>', Decimal(0.05).quantize(Decimal('0.1'), rounding=ROUND_HALF_EVEN))
print('0.15 =>', Decimal(0.15).quantize(Decimal('0.1'), rounding=ROUND_HALF_EVEN))
print('0.25 =>', Decimal(0.25).quantize(Decimal('0.1'), rounding=ROUND_HALF_EVEN))
print('0.35 =>', Decimal(0.35).quantize(Decimal('0.1'), rounding=ROUND_HALF_EVEN))
print('0.45 =>', Decimal(0.45).quantize(Decimal('0.1'), rounding=ROUND_HALF_EVEN))


    

    




0.05 => 0.1
0.15 => 0.1
0.25 => 0.2
0.35 => 0.3
0.45 => 0.5

In [13]:

    

print('0.05 =>', Decimal(str(0.05)).quantize(Decimal('0.1'), rounding=ROUND_HALF_EVEN))
print('0.15 =>', Decimal(str(0.15)).quantize(Decimal('0.1'), rounding=ROUND_HALF_EVEN))
print('0.25 =>', Decimal(str(0.25)).quantize(Decimal('0.1'), rounding=ROUND_HALF_EVEN))
print('0.35 =>', Decimal(str(0.35)).quantize(Decimal('0.1'), rounding=ROUND_HALF_EVEN))
print('0.45 =>', Decimal(str(0.45)).quantize(Decimal('0.1'), rounding=ROUND_HALF_EVEN))


    

    




0.05 => 0.0
0.15 => 0.2
0.25 => 0.2
0.35 => 0.4
0.45 => 0.4

In [14]:

    

print(Decimal(2.675))


    

    




2.67499999999999982236431605997495353221893310546875

In [15]:

    

print(Decimal(2.675).quantize(Decimal('0.01'), rounding=ROUND_HALF_UP))


    

    




2.67

In [16]:

    

print(Decimal(str(2.675)).quantize(Decimal('0.01'), rounding=ROUND_HALF_UP))


    

    




2.68

In [17]:

    

print(Decimal(2.675).quantize(Decimal('0.01'), rounding=ROUND_HALF_EVEN))


    

    




2.67

In [18]:

    

print(Decimal(str(2.675)).quantize(Decimal('0.01'), rounding=ROUND_HALF_EVEN))


    

    




2.68

In [19]:

    

d = Decimal('123.456').quantize(Decimal('0.01'), rounding=ROUND_HALF_UP)


    

In [20]:

    

print(d)


    

    




123.46

In [21]:

    

print(type(d))


    

    




<class 'decimal.Decimal'>

In [22]:

    

# print(1.2 + d)
# TypeError: unsupported operand type(s) for +: 'float' and 'decimal.Decimal'


    

In [23]:

    

print(1.2 + float(d))


    

    




124.66

In [24]:

    

i = 99518


    

In [25]:

    

print(Decimal(i).quantize(Decimal('10'), rounding=ROUND_HALF_UP))


    

    




99518

In [26]:

    

print(Decimal('10').as_tuple())


    

    




DecimalTuple(sign=0, digits=(1, 0), exponent=0)

In [27]:

    

print(Decimal('1E1').as_tuple())


    

    




DecimalTuple(sign=0, digits=(1,), exponent=1)

In [28]:

    

print(Decimal(i).quantize(Decimal('1E1'), rounding=ROUND_HALF_UP))


    

    




9.952E+4

In [29]:

    

print(int(Decimal(i).quantize(Decimal('1E1'), rounding=ROUND_HALF_UP)))


    

    




99520

In [30]:

    

print(int(Decimal(i).quantize(Decimal('1E2'), rounding=ROUND_HALF_UP)))


    

    




99500

In [31]:

    

print(int(Decimal(i).quantize(Decimal('1E3'), rounding=ROUND_HALF_UP)))


    

    




100000

In [32]:

    

print('4 =>', int(Decimal(4).quantize(Decimal('1E1'), rounding=ROUND_HALF_UP)))
print('5 =>', int(Decimal(5).quantize(Decimal('1E1'), rounding=ROUND_HALF_UP)))
print('6 =>', int(Decimal(6).quantize(Decimal('1E1'), rounding=ROUND_HALF_UP)))


    

    




4 => 0
5 => 10
6 => 10