Virtual environment in python

python ka virtual enviornment banane ke liye sabse phle jis folder mai aapko apna virtual enviornment banana hai bo folder ko aap agar windows mai hai to cmd yaa phir powershell mai khol lenge phir uske baad aap ko i=usme ek module install karna hai pip ki madad se jiska naam hai virtualenv yaa phir aap seedhe is command ko bhi run kar sakte hai jiska naam hai pip install virtualenv.

Phir iske baad aapko apne cmd yaa powershell window par likhna hoga virtualenv foldername. idhar filename mai aapko apne folder ka naam daalna hai jo ki aapko create karna chaahte hai.

phir ye karne ke baad aapko simply us virtual enviornment ko activate karna hoga usko activate karne ke liye aap yaa to seedhe hi apne us folder ke andar jaaker jo ki aapne create kiya hai uske andar jaakar aapko ek scripts naam ka folder dekhne ko milega aapko uske andar jaakar ke aapko apne virtual enviornment ko activate kar lena hai. phir uske baad aapka virtual enviornment ban ke taiyaar hai.

Error - agar aapko activate kart samay ki error milti hai to aap simply usme set-executionpolicy remotesigned phir uske baad aapko simply a yaa phir y apni jarurat ke hisab se press kar dena hai.

export - agar aap apna project kisi ko dete hai ye virtual enviornment ke andar jo project bana hai bo to aapko ye bhi jaanna bahut jaruri hai ki virtual enviornment mai jo aapne packages or jo modules aapne install kiye hai bo saamne bale ke mai honge ki nahi isilye aapko agar ye modules ssamne bale ko batane hai ki usme konsa version ka konsa module use kiya jai us project ko banane mai to aapko simply type karna hoga pip freeze > requirements.txt. aur agar aapko ye ssare packages ko install karna hai to simple type karna hoga pip install -r  .\requirements.txt bas itna likhne se aapka project ke saari requirements ssamne baale ke computer mai install ho jaayenge.

aur ek baar aapka agar kaam pura ho jaata hai to aap apne virtual enviornment ko deactivate bhi karna hai aur usko deactivate karna baise to jaruri hai yaa nahi ye to mujhe bhi nahi pata lekin aia karna ek achi practice hai. aur isko deactivate karna bhi bahut simple hai aapko bas apne cmd yaa powershell mai type karna hai deactivate aur aapka virtual enviornment deactivate ho jaayega.

All commands that are used in creating virtual enviornment

(funfacts:

    1. No global packages work in virtual enviornment.

    2. agar aapko error milta hai activate karte samay to aap us folder ko cmd or Powershell mai se kisi ko bhi admin permission se kholenge to bo error aapko dekhne ko nahi milega

    3. agar aap chahte hai ki aapke virtual enviornment mai bo ssare packages aaye jo ki global hai matlab ki jo packages aapke bahar bale matlab ki main bale python mai bhi hai to aapko simply is command(virtualenv foldername) ko is command(virtualenv --system-site-packages foldername) se replace karna hoga)

1. pip install virtualenv

2. virtualenv "foldername"

3. .\foldername\scripts\activate

    if error comes :

                               Type following commands:

                        set-executionpolicy remotesigned

4. pip freeze > requirements.txt

5. pip install -r .\requirements.txt

6. deactivate (for deactivating the virtual enviornment)

7. exit