python 2.7 - Import Madness: using absolute imports doesn't work -

-

recently, working on project, had sandbox, developing part of application. idea develop features in sandbox, , after tests, move proper project packages. please, not discuss approach, main case import problem, not work organisation.

using approach, structure of sandbox:

 sandbox   |   +- importer       |       +-- __init__.py              +-- ca            |            +-- __init__.py            +-- ca.py            +-- zombie.py

content of files:

  • importer/__init__.py

    import importer.ca

  • importer/ca/__init__.py

    from ca import *

  • importer/ca/ca.py

    import importer.ca.zombie zombie

all other files empty.

after running python interpreter:

>>> import importer traceback (most recent call last):   file "<stdin>", line 1, in <module>   file "importer\__init__.py", line 1, in <module>     import importer.ca   file "importer\ca\__init__.py", line 1, in <module>     ca import *   file "importer\ca\ca.py", line 2, in <module>     import importer.ca.zombie zombie attributeerror: 'module' object has no attribute 'ca'

there sandbox directory in sys.path.

when delete content of importer/ca/ca.py, i'm able import importer. moreover, when change content of importer/ca/ca.py import importer.ca.zombie or import zombie or from importer.ca import zombie work fine. going further, using 1 of option work, print out module cache:

>>> import sys >>> in sorted(sys.modules.keys()): print

i get:

... errno exceptions functools genericpath importer importer.ca importer.ca.ca importer.ca.importer importer.ca.zombie importer.importer linecache locale nt ...

importer.ca.importer , importer.importer nones. , how did ther go there?

so, summarize, question not how make work, why works way. why can't use absolute import path import importer.ca.zombie zombie , what's going on in sys.module cache?


Comments

Post a Comment

Popular posts from this blog

Spring Boot + JPA + Hibernate: Unable to locate persister -

-
i trying work entity inside request method of spring boot application. entity in project , pom.xml has dependencies it. why error message?: org.hibernate.unknownentitytypeexception: unable locate persister: com.ric.bill.model.bs.par package com.ric.web; import java.util.concurrent.atomic.atomiclong; import javax.persistence.entitymanager; import javax.persistence.persistencecontext; import net.sf.ehcache.cachemanager; import net.sf.ehcache.management.cache; import net.sf.ehcache.management.cachestatistics; import org.hibernate.stat.statistics; import org.springframework.beans.factory.annotation.autowired; import org.springframework.boot.autoconfigure.domain.entityscan; import org.springframework.cache.annotation.enablecaching; import org.springframework.transaction.annotation.enabletransactionmanagement; import org.springframework.transaction.annotation.propagation; import org.springframework.transaction.annotation.transactional; import org.springframework.web.bind.annotati...
Read more

go - Golang: panic: runtime error: invalid memory address or nil pointer dereference using bufio.Scanner -

-
i implementing go program uses bufio.scanner , bufio.writer have packaged code follows package main import ( "fmt" "player/command" "strings" ) func main() { //enter code here. read input stdin. print output stdout commands.scanner.scan() { //scan new line , send comand variable check command exist or not input := strings.split(strings.trim(commands.scanner.text(), " "), " ") command := input[0] if command == "" { fmt.printf("$ %s:", commands.pwd) continue } if !commands.commands[command] { commands.throwerror("cannot recognize input.") } else { commands.execute(command, input[1:], nil) } fmt.printf("$ %s:", commands.pwd) } } i using init.go file in main package follows package main import ( "flag" "player/sourc...
Read more

c - double free or corruption (fasttop) -

-
this code reads null terminated string file (file containing null terminated strings & should provide index wanted string). error: *** error in `./main': double free or corruption (fasttop): 0x090a4a80 *** aborted code: char *tmp_realloc=null; char *sstring=null; int i=1; /*set file pointer point string*/ fseek(fh,index,seek_set); sstring=(char*)malloc(sizeof(char)); if(sstring == null) return null; tmp_realloc=sstring; while( (*(sstring+i-1)=(char)fgetc((file*)fh)) != 0x0 ) { /*reallocate more memory*/ tmp_realloc=(char*)realloc((char*)sstring,++i); /*if not same address copy old new & set old point new*/ if(tmp_realloc != sstring){ strcpy((char*)tmp_realloc,(char*)sstring); free(sstring); sstring=tmp_realloc; } } could tell me pointer causing issue (& reason) ? remove part /*if not same address copy old new & set old point new*/ if(tmp_realloc != sstring){ strc...
Read more