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πŸ–₯ ПониманиС lambda-Ρ„ΡƒΠ½ΠΊΡ†ΠΈΠΉ Π² Python с ΠΏΡ€ΠΈΠΌΠ΅Ρ€Π°ΠΌΠΈ

Как извСстно, ΠΌΡ‹ ΠΈΡΠΏΠΎΠ»ΡŒΠ·ΡƒΠ΅ΠΌ Ρ„ΡƒΠ½ΠΊΡ†ΠΈΠΈ для Π°Π²Ρ‚ΠΎΠΌΠ°Ρ‚ΠΈΠ·Π°Ρ†ΠΈΠΈ процСссов Π² ΠΏΡ€ΠΎΠ³Ρ€Π°ΠΌΠΌΠ½ΠΎΠΌ обСспСчСнии.

Lambda-Ρ„ΡƒΠ½ΠΊΡ†ΠΈΠΈ Π½Π° самом Π΄Π΅Π»Π΅ просто извСстны ΠΊΠ°ΠΊ Π°Π½ΠΎΠ½ΠΈΠΌΠ½Ρ‹Π΅ Ρ„ΡƒΠ½ΠΊΡ†ΠΈΠΈ. Π’Π°ΠΊΠΈΠΌ ΠΎΠ±Ρ€Π°Π·ΠΎΠΌ, принимая любоС количСство Π°Ρ€Π³ΡƒΠΌΠ΅Π½Ρ‚ΠΎΠ², ΠΌΡ‹ ΠΏΠΎΠ»ΡƒΡ‡Π°Π΅ΠΌ Π² Ρ€Π΅Π·ΡƒΠ»ΡŒΡ‚Π°Ρ‚Π΅ Π²Ρ‹Ρ€Π°ΠΆΠ΅Π½ΠΈΠ΅.

По сути, lambda-функция, которая ΠΏΡ€ΠΈΠ½ΠΈΠΌΠ°Π΅Ρ‚ ΠΏΠ°Ρ€Π°ΠΌΠ΅Ρ‚Ρ€ x ΠΈ Π²ΠΎΠ·Π²Ρ€Π°Ρ‰Π°Π΅Ρ‚ Π΅Π³ΠΎ, выглядит Ρ‚Π°ΠΊ:

func = lambda x : x
ΠžΠ±Ρ€Π°Ρ‚ΠΈΡ‚Π΅ Π²Π½ΠΈΠΌΠ°Π½ΠΈΠ΅, ΠΊΠ°ΠΊ ΠΌΡ‹ ΠΈΡΠΏΠΎΠ»ΡŒΠ·ΡƒΠ΅ΠΌ здСсь ΠΊΠ»ΡŽΡ‡Π΅Π²ΠΎΠ΅ слово lambda. И это ΠΏΠΎ сути Ρ‚Π° ΠΆΠ΅ самая ситуация, ΠΊΠΎΠ³Π΄Π° функция, опрСдСлСнная Π² python, просто Π²ΠΎΠ·Π²Ρ€Π°Ρ‰Π°Π΅Ρ‚ сСбя:

def func(x):
return x

А Ρ‚Π΅ΠΏΠ΅Ρ€ΡŒ Π΄Π°Π²Π°ΠΉΡ‚Π΅ ΠΏΡ€ΠΈΠ²Π΅Π΄Π΅ΠΌ Π΅Ρ‰Π΅ ΠΎΠ΄ΠΈΠ½ ΠΏΡ€ΠΈΠΌΠ΅Ρ€ Ρ‚ΠΎΠ³ΠΎ, ΠΊΠ°ΠΊΠΈΠ΅ Π΄Ρ€ΡƒΠ³ΠΈΠ΅ Π²Π°Ρ€ΠΈΠ°Π½Ρ‚Ρ‹ использования lambda ΠΌΠΎΠ³ΡƒΡ‚ Π±Ρ‹Ρ‚ΡŒ Π² ΠΎΠ΄Π½ΠΎΠΉ ΠΈ Ρ‚ΠΎΠΉ ΠΆΠ΅ строкС Π² быстрой ΠΏΠΎΡΠ»Π΅Π΄ΠΎΠ²Π°Ρ‚Π΅Π»ΡŒΠ½ΠΎΡΡ‚ΠΈ:

print((lambda x: x + 10)(90))
output:
100


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πŸ–₯ ПониманиС lambda-Ρ„ΡƒΠ½ΠΊΡ†ΠΈΠΉ Π² Python с ΠΏΡ€ΠΈΠΌΠ΅Ρ€Π°ΠΌΠΈ

Как извСстно, ΠΌΡ‹ ΠΈΡΠΏΠΎΠ»ΡŒΠ·ΡƒΠ΅ΠΌ Ρ„ΡƒΠ½ΠΊΡ†ΠΈΠΈ для Π°Π²Ρ‚ΠΎΠΌΠ°Ρ‚ΠΈΠ·Π°Ρ†ΠΈΠΈ процСссов Π² ΠΏΡ€ΠΎΠ³Ρ€Π°ΠΌΠΌΠ½ΠΎΠΌ обСспСчСнии.

Lambda-Ρ„ΡƒΠ½ΠΊΡ†ΠΈΠΈ Π½Π° самом Π΄Π΅Π»Π΅ просто извСстны ΠΊΠ°ΠΊ Π°Π½ΠΎΠ½ΠΈΠΌΠ½Ρ‹Π΅ Ρ„ΡƒΠ½ΠΊΡ†ΠΈΠΈ. Π’Π°ΠΊΠΈΠΌ ΠΎΠ±Ρ€Π°Π·ΠΎΠΌ, принимая любоС количСство Π°Ρ€Π³ΡƒΠΌΠ΅Π½Ρ‚ΠΎΠ², ΠΌΡ‹ ΠΏΠΎΠ»ΡƒΡ‡Π°Π΅ΠΌ Π² Ρ€Π΅Π·ΡƒΠ»ΡŒΡ‚Π°Ρ‚Π΅ Π²Ρ‹Ρ€Π°ΠΆΠ΅Π½ΠΈΠ΅.

По сути, lambda-функция, которая ΠΏΡ€ΠΈΠ½ΠΈΠΌΠ°Π΅Ρ‚ ΠΏΠ°Ρ€Π°ΠΌΠ΅Ρ‚Ρ€ x ΠΈ Π²ΠΎΠ·Π²Ρ€Π°Ρ‰Π°Π΅Ρ‚ Π΅Π³ΠΎ, выглядит Ρ‚Π°ΠΊ:

func = lambda x : x
ΠžΠ±Ρ€Π°Ρ‚ΠΈΡ‚Π΅ Π²Π½ΠΈΠΌΠ°Π½ΠΈΠ΅, ΠΊΠ°ΠΊ ΠΌΡ‹ ΠΈΡΠΏΠΎΠ»ΡŒΠ·ΡƒΠ΅ΠΌ здСсь ΠΊΠ»ΡŽΡ‡Π΅Π²ΠΎΠ΅ слово lambda. И это ΠΏΠΎ сути Ρ‚Π° ΠΆΠ΅ самая ситуация, ΠΊΠΎΠ³Π΄Π° функция, опрСдСлСнная Π² python, просто Π²ΠΎΠ·Π²Ρ€Π°Ρ‰Π°Π΅Ρ‚ сСбя:

def func(x):
return x

А Ρ‚Π΅ΠΏΠ΅Ρ€ΡŒ Π΄Π°Π²Π°ΠΉΡ‚Π΅ ΠΏΡ€ΠΈΠ²Π΅Π΄Π΅ΠΌ Π΅Ρ‰Π΅ ΠΎΠ΄ΠΈΠ½ ΠΏΡ€ΠΈΠΌΠ΅Ρ€ Ρ‚ΠΎΠ³ΠΎ, ΠΊΠ°ΠΊΠΈΠ΅ Π΄Ρ€ΡƒΠ³ΠΈΠ΅ Π²Π°Ρ€ΠΈΠ°Π½Ρ‚Ρ‹ использования lambda ΠΌΠΎΠ³ΡƒΡ‚ Π±Ρ‹Ρ‚ΡŒ Π² ΠΎΠ΄Π½ΠΎΠΉ ΠΈ Ρ‚ΠΎΠΉ ΠΆΠ΅ строкС Π² быстрой ΠΏΠΎΡΠ»Π΅Π΄ΠΎΠ²Π°Ρ‚Π΅Π»ΡŒΠ½ΠΎΡΡ‚ΠΈ:

print((lambda x: x + 10)(90))
output:
100


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