Python 错误名称错误：未定义名称“np”
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Error NameError: name 'np' is not defined
提问by Piistasyo
from numpy import *
x = np.random.randint(low=10, high=30, size=6)
print(x)
"C:\Users\Piistasyo\PycharmProjects\test project\venv\Scripts\python.exe" "C:/Users/Piistasyo/PycharmProjects/test project/loop.py"
Traceback (most recent call last):
File "C:/Users/Piistasyo/PycharmProjects/test project/loop.py", line 44, in <module>
x = np.random.randint(low=10, high=30, size=6)
NameError: name 'np' is not defined
why am i getting this error? pls help i already installed the numpy package
为什么我收到这个错误？请帮助我已经安装了 numpy 包
回答by U10-Forward
As @aydow says, "change from numpy import *to import numpy as np":
正如@aydow 所说，“更改from numpy import *为import numpy as np”：
import numpy as np
...
Or don't write np:
或者不写np：
from numpy import *
x = random.randint(low=10, high=30, size=6)
...
Because, from numpy import *, Import every function in numpy, so npis not a function of numpy, so have to Import numpy like import numpy as np, Or, Remove nppart of np.random.randint(low=10, high=30, size=6), and make it like this: random.randint(low=10, high=30, size=6), it's all since randomis a function of numpy, basically that's all, to explain
因为，from numpy import *, 导入 numpy 中的每个函数，所以np不是 numpy 的函数，所以必须导入 numpy 之类的import numpy as np, 或者，删除np一部分np.random.randint(low=10, high=30, size=6)，并使其像这样：random.randint(low=10, high=30, size=6)，这都是因为random是 numpy 的函数，基本上就是这样，解释
回答by Green Cloak Guy
You haven't defined np.
你还没有定义np.
The first thing you're currently doing is
您目前正在做的第一件事是
from numpy import *
This imports the package numpy, and everything inside of that package. However, numpy does not contain a module called np. The typical practice for numpy is to insteaddo
这将导入 packagenumpy以及该包中的所有内容。但是，numpy 不包含名为np. 为numpy的典型做法是不是做
import numpy as np
This imports justthe package numpy, and renames it to npso that you can dereference it by using the dot operator on np. This allows you to call np.random(), since randomis a member of numpy, which is aliased to np.
这仅导入包numpy，并将其重命名为 ，np以便您可以使用点运算符 on 取消引用它np。这允许您调用np.random()，因为random是 的成员numpy，别名为np。
With what you're currently doing, you could do either numpy.random()or just random(since it was part of the *that you imported from numpy).
对于您目前正在做的事情，您可以做numpy.random()或只做random（因为它是*您从 numpy 导入的一部分）。
