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Python - round() method example
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round() is a method that returns a number that is rounded to the closest integer number or specified number of decimal places.
One argument:
xxxxxxxxxx1
print(round(5.0)) # 52
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print(round(2.49)) # 24
print(round(2.50)) # 35
print(round(2.51)) # 36
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print(round(-2.49)) # -28
print(round(-2.50)) # -29
print(round(-2.51)) # -310
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print(round(0.999)) # 112
print(round(1.001)) # 113
print(round(-1.001)) # -1Two arguments:
xxxxxxxxxx1
print(round(1.999, 0)) # 2.02
print(round(1.199, 1)) # 1.23
print(round(1.019, 2)) # 1.02
| Syntax |
xxxxxxxxxx1 round(number)or xxxxxxxxxx1 round(number, precision) |
| Parameters |
|
| Result | Rounded number value. |
| Description | round is a method that returns a number that is rounded to the closest integer number. |
This section contains a custom function that shows how to round number with precision to n places.
xxxxxxxxxx1
import math2
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def round_precised(number, precision):5
power = math.pow(10, precision)6
return round(number / power) / power7
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print(round_precised(5, 0)) # 5.010
print(round_precised(5.0, 0)) # 5.011
print(round_precised(0.5, 0)) # 0.012
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print(round_precised(1.2345, 0)) # 1.014
print(round_precised(1.2345, 1)) # 1.215
print(round_precised(1.2345, 2)) # 1.2316
print(round_precised(1.2345, 3)) # 1.23417
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print(round_precised(-1.2345, 0)) # -1.019
print(round_precised(-1.2345, 1)) # -1.220
print(round_precised(-1.2345, 2)) # -1.2321
print(round_precised(-1.2345, 3)) # -1.23422
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print(round_precised(12345, -1)) # 12340.024
print(round_precised(12345, -2)) # 12300.025
print(round_precised(12345, -3)) # 12000.0This section contains custom round function implementation.
xxxxxxxxxx1
import math2
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def round_number(value):5
if value < 0.0:6
rest = value % 1.07
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if rest < -0.5:9
rest += 1.010
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return value - rest12
else:13
value += 0.514
return value - (value % 1.0)15
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print(round_number(5)) # 518
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print(round_number(2.49)) # 220
print(round_number(2.50)) # 321
print(round_number(2.51)) # 322
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print(round_number(0.999)) # 124
print(round_number(1.001)) # 125
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print(round_number(-2.49)) # -227
print(round_number(-2.50)) # -228
print(round_number(-2.51)) # -329
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print(round_number(-1.001)) # -1