如何訪問環(huán)境變量值？我在Python應(yīng)用程序中設(shè)置了要訪問的環(huán)境變量。我怎么得到這個(gè)價(jià)值？
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TA貢獻(xiàn)1796條經(jīng)驗(yàn) 獲得超7個(gè)贊
import osprint(os.environ['HOME'])
os.environ
# using get will return `None` if a key is not present rather than raise a `KeyError`print(os.environ.get('KEY_THAT_MIGHT_EXIST'))
# os.getenv is equivalent, and can also give a default value instead of `None`print(os.getenv('KEY_THAT_MIGHT_EXIST', default_value))C:\Python
import sysprint(sys.prefix)
繁星點(diǎn)點(diǎn)滴滴
TA貢獻(xiàn)1803條經(jīng)驗(yàn) 獲得超3個(gè)贊
TrueFalse)
'HOME' in os.environ
get()
print(os.environ.get('HOME', '/home/username/'))/home/username/
米脂
TA貢獻(xiàn)1836條經(jīng)驗(yàn) 獲得超3個(gè)贊
try: os.environ["FOO"]except KeyError: print "Please set the environment variable FOO" sys.exit(1)
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