UnboundLocalError: local variable 'm_final_total' referenced before assignment
时间: 2024-02-18 20:47:40 浏览: 26
This error occurs when a local variable is referenced before it has been assigned a value. In Python, when a variable is defined within a function, it is considered a local variable, and it cannot be accessed until it has been assigned a value.
To resolve this error, make sure that the variable is assigned a value before it is referenced. Check to see if there are any conditions or statements that prevent the variable from being assigned a value before it is used. You may need to reorganize your code or add additional logic to ensure that the variable is properly initialized before it is used.
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UnboundLocalError: local variable 'final_distance_positive' referenced before assignment
This error occurs when a variable is accessed before being assigned a value within a local scope. Here is an example code that can produce this error:
```python
def calculate_distance(distance):
if distance > 0:
final_distance_positive = distance
return final_distance_positive
distance = 10
result = calculate_distance(distance)
print(result)
```
In this code, the function `calculate_distance()` checks if the input `distance` is positive. If it is, the variable `final_distance_positive` is assigned the value of `distance`. However, if `distance` is negative, the variable is never assigned a value. If the input is negative, the function will return an `UnboundLocalError` because `final_distance_positive` was never defined.
To fix this error, make sure to assign a default value to the variable outside of the conditional statement, or handle the negative condition properly. Here is an updated code that fixes this error:
```python
def calculate_distance(distance):
final_distance_positive = 0 # assign a default value
if distance > 0:
final_distance_positive = distance
return final_distance_positive
distance = 10
result = calculate_distance(distance)
print(result) # prints 10
distance = -10
result = calculate_distance(distance)
print(result) # prints 0
```
In this code, we assign a default value of 0 to `final_distance_positive` before the conditional statement. If the input `distance` is negative, the function will return the default value instead of throwing an error.
UnboundLocalError: local variable 'run_Graspnet_flag' referenced before assignment
```python
def test_scopt():
try:
print(run_Graspnet_flag) # 会报错:UnboundLocalError: local variable 'run_Graspnet_flag' referenced before assignment
except UnboundLocalError as e:
print(e)
```
```python
def func(flag=True):
try:
if flag:
run_Graspnet_flag = 3
return run_Graspnet_flag # 会报错:UnboundLocalError: local variable 'run_Graspnet_flag' referenced before assignment
except UnboundLocalError as e:
print(e)
```