This is because there is no default in , so we just need to import the relevant modules and then convert them to Python program pyspark.sql.session . sparksession sparksession .
Related codes:
from pyspark.context import SparkContext
from pyspark.sql.session import SparkSession
sc = SparkContext('local')
spark = SparkSession(sc)
print(type(spark))
Print out its type and solve it successfully:
& lt; class' pyspark.sql.session .SparkSession'>
terms of settlement:
Add ‘{}’ before the value to be assigned to the cell
For example:
class_id(1)='cafe'；It should be changed to,
class_id(1)={'cafe'}；
Pay attention to check the error prompts, which will generally tell you where to find the reason. Assignment under multiple single edges is not supported
Let’s look at your code. Where is edge related? (posedge sclk or posedge reset)
That’s how we usually use it,
always @ (posedge clk or posedge reset)
if (reset == 1’b1)
….
else
Reset is the reset signal,
If your code doesn’t have the following reset part, it will think that this is a clock sampling, and multiple clocks will take the same data, so it will report an error.
The problem recurred
When I use pickle to reload data, all the errors are as follows:
Traceback (most recent call last):
File "segment.py", line 17, in <module>
word2id = pickle.load(pk)
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/pickle.py", line 1378, in load
return Unpickler(file).load()
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/pickle.py", line 858, in load
dispatch[key](self)
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/pickle.py", line 1090, in load_global
klass = self.find_class(module, name)
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/pickle.py", line 1124, in find_class
__import__(module)
ImportError: No module named indexes.baseThe reason for this
The same code and data run on two different machines. At first, I thought the wrong machine was missing some Python packages. But there are too many packages to install, so I can’t try them one by one. Fortunately, I use virsualenv to copy the environment from another machine to this machine directly. After running, there is no problem. But in order to find out which Python installation package is missing, I use the original compilation environment, reuse pickle to generate the original data to be loaded, and then reload it At this time, there was no error.
summary
To sum up, the reason is that the original version of panda used in the generation of pickle file is different from the current version of load pickle file. So whether it is to write code in Python or other languages, the compiling environment is very important. Once the version of a package is different, it may also lead to program errors.
Arrow function should not return assignment no return assignment.
This paper describes the problems encountered in learning p221 of the latest Vue and vuejs in 2019, from introduction to mastery. Because the checking code of eslint is referenced, the checking error is reported. There is no problem with the code, it is the problem of eslint checking.
Solutions: 1. Remove eslint
2. Modify the code to conform to eslint
original code
if (this.isSelectAll) {
this.cartList.forEach(item => item.checked = false)
} else {
this.cartList.forEach(item => item.checked = true)
}
Changed code
if (this.isSelectAll) {
this.cartList.forEach(item => { item.checked = false })
} else {
this.cartList.forEach(item => { item.checked = true })
}
After learning the arrow function, we can know that the {} added can be omitted, but the rule of eslint requires this.
Problems with new PC configuration environment:
The node cannot be found, but when it is reinstalled, it will be prompted with node: or the node will report an error: no such keg: / usr / local / cellular / node
brew cleanup
brew link node
brew uninstall node
brew uninstall –force node
brew install node
Install NVM command (node version management tool)
curl -o- https://raw.githubusercontent.com/creationix/nvm/v0.33.11/install.sh | bash
Press finish to restart item
Install n (node version management tool)
$ sudo npm install -g n
Brew installation command:
/usr/bin/ruby -e “$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install )”
Oh my Zsh. Git plug in installation command
sh -c “$(curl -fsSL https://raw.github.com/robbyrussell/oh-my-zsh/master/tools/install.sh )”
Git set alias
We just need to type a command and tell git, then st means status:
git config –global alias.s status
git config –global alias.c commit
git config –global alias.ck checkout
git config –global alias.a add
No bundle URL present
Appdelegate. M modify the generated code
jsCodeLocation = [NSURL URLWithString:@” http://127.0.0.1 :8081/ index.bundle?platform=ios& ;dev=false”];
New computer error reporting unit test error reporting jest.mock () is not allowed to reference any out-of-scope variables
Node version problem reduced to v8.12.0 or v6.11.3
If the node version switch is useless, please use:
NVM alias default v6.11.3 to modify the default node version
Error: ‘ASCII’ codec can’t decode byte 0x90 in position 614: normal not in range (128)
modified:
original code: pickle.load (f)
is amended as follows: pickle.load (f,encoding=‘bytes’)
An error is reported when the jstack command is executed. The error is as follows
Unable to open socket file: target process not responding or HotSpot VM not loaded
The -F option can be used when the target process is not respondingThis process can be viewed through PS command
I found an article about jstack command not configured well on the Internet
Switch to the / tmp directory
cd /tmpThere are several directories at the beginning of hsperfdata. Go to the directory to see if there is a process number executed by jstack
After checking, it is found that the process behind jstack is not executed by the root user, and the switch to another user is successful
Later, we found that PS – aux can also see who executed the process, so we don’t have to be so troublesome
Click the event system in the hierarchy panel, and in the inspector panel, check out the standalone input module.
If you want to use a list to dynamically add numpy type data, as shown in the following code, you will find that the error type error is: ‘ numpy.int64 ‘ object is not iterable
a = []
b = np.array([1,2,3])
a.extend(b[0])
a.extend(b[1])
a.extend(b[2])
print(a)The numpy data is converted to the list type, as follows:
a = []
b = np.array([1,2,3])
a.extend(b[0].tolist())
a.extend(b[1].tolist())
a.extend(b[2].tolist())
print(a)Error found: typeerror: ‘Int’ object is not Iterable
By printing the type of ‘B [0]. Tolist ()’, we find that the type of ‘B [0]. Tolist ()’ is’ Int ‘, that is, it does not convert’ B [0]. Tolist () ‘to list type
Then modify the code as follows, change ‘B [0]. Tolist ()’ to list type by adding a bracket []
a = []
b = np.array([1,2,3])
a.extend([b[0].tolist()])
a.extend([b[1].tolist()])
a.extend([b[2].tolist()])
print(a) #[1, 2, 3]————————————————————————-Dividing line————————————————————————————————–
Later, I found that the following code can also be used directly:
a = []
b = np.array([1,2,3])
a.extend([b[0]])
a.extend([b[1]])
a.extend([b[2]])
print(a) #[1, 2, 3]This is because the ‘B [0]’ is changed from numpy data type to list type by adding a bracket []
Error analysis of receive comments before first target. Stop
Today, make an example of using the make file, install the operation and write the file. This error occurred using ‘make – F makefile1’.
recipe commences before first target. Stop
The content of makefile1 is also very simple
[tab]3.o: 3.c b.h c.h
[tab][tab]gcc -c 3.c
Later, it was found that the [tab] in the first line needed to be deleted, and the command passed.
3.o: 3.c b.h c.h
[tab][tab]gcc -c 3.c
There is a very regrettable syntax phenomenon in makefile: there is a difference between control and tab. The line of the rule must start with a tab, not a space.
Memtrack: couldn’t load memtrack module (no such file or directory)
Reference article:
(1) Memtrack: couldn’t load memtrack module (no such file or directory)
（2） https://www.cnblogs.com/geili/p/10198878.html
Let’s make a note.