File biner menangani data dalam bentuk byte. Oleh karena itu, mereka dapat digunakan untuk membaca atau menulis file teks, gambar atau audio dan video. Untuk membuka file biner untuk tujuan membaca, kita dapat menggunakan mode 'rb'. Di sini, 'b' dilampirkan ke 'r' untuk menyatakan bahwa itu adalah file biner. Demikian pula untuk menulis byte ke dalam file biner, kita dapat menggunakan mode 'wb'. Untuk membaca byte dari file biner, kita dapat menggunakan metode read[] dan untuk menulis byte ke dalam file biner, kita dapat menggunakan metode write[]
Mari kita menulis sebuah program di mana kita ingin membuka file gambar seperti. jpg,. gif atau. png dan membaca byte dari file tersebut. Byte ini kemudian ditulis ke dalam file biner baru. Artinya kita menyalin file gambar sebagai file lain
Program Python untuk Menyalin File Biner
Contoh berikut akan menyalin file gambar ke file lain
#copying an image into a file #open the files in binary mode f1 = open['cat.jpg', 'rb'] f2 = open['new.jpg', 'wb'] #read bytes from f1 and write into f2 bytes = f1.read[] f2.write[bytes] #close the files f1.close[]
Dalam Python, modul menyediakan metode dari tiga jenis operasi IO; . Cara kanonik untuk membuat objek file adalah dengan menggunakan fungsi
>>> f = open['C:\myfile.txt'] # opening a file
>>> lines = f.read[] # reading a file
>>> lines
'This is the first line. \nThis is the second line.\nThis is the third line.'
>>> f.close[] # closing file object
Setiap operasi file dapat dilakukan dalam tiga langkah berikut
- Buka file untuk mendapatkan objek file menggunakan fungsi open[] bawaan. Ada berbagai mode akses, yang dapat Anda tentukan saat membuka file menggunakan fungsi open[]
- Lakukan operasi baca, tulis, tambahkan menggunakan objek file yang diambil dari fungsi
2>>> f = open['C:\myfile.txt'] # opening a file >>> lines = f.read[] # reading a file >>> lines 'This is the first line. \nThis is the second line.\nThis is the third line.' >>> f.close[] # closing file object - Tutup dan buang objek file
File Bacaan
Objek file menyertakan metode berikut untuk membaca data dari file
- baca [karakter]. membaca jumlah karakter yang ditentukan mulai dari posisi saat ini
- garis baca[]. membaca karakter mulai dari posisi membaca saat ini hingga karakter baris baru
- garis baca[]. membaca semua baris hingga akhir file dan mengembalikan objek daftar
File
>>> f = open['C:\myfile.txt'] # opening a file
>>> lines = f.read[] # reading a file
>>> lines
'This is the first line. \nThis is the second line.\nThis is the third line.'
>>> f.close[] # closing file object
C. \file saya. txt
SalinanThis is the first line.
This is the second line.
This is the third line.
Contoh berikut menjalankan operasi baca menggunakan metode
>>> f = open['C:\myfile.txt'] # opening a file
>>> lines = f.read[] # reading a file
>>> lines
'This is the first line. \nThis is the second line.\nThis is the third line.'
>>> f.close[] # closing file object
Contoh. Membaca File
Salinan>>> f = open['C:\myfile.txt'] # opening a file
>>> lines = f.read[] # reading a file
>>> lines
'This is the first line. \nThis is the second line.\nThis is the third line.'
>>> f.close[] # closing file object
Di atas,
>>> f = open['C:\myfile.txt'] # opening a file
>>> lines = f.read[] # reading a file
>>> lines
'This is the first line. \nThis is the second line.\nThis is the third line.'
>>> f.close[] # closing file object
>>> f = open['C:\myfile.txt'] # opening a file
>>> lines = f.read[] # reading a file
>>> lines
'This is the first line. \nThis is the second line.\nThis is the third line.'
>>> f.close[] # closing file object
>>> f = open['C:\myfile.txt'] # opening a file
>>> lines = f.read[] # reading a file
>>> lines
'This is the first line. \nThis is the second line.\nThis is the third line.'
>>> f.close[] # closing file object
>>> f = open['C:\myfile.txt'] # opening a file
>>> lines = f.read[] # reading a file
>>> lines
'This is the first line. \nThis is the second line.\nThis is the third line.'
>>> f.close[] # closing file object
>>> f = open['C:\myfile.txt'] # opening a file
>>> line1 = f.readline[] # reading a line
>>> line1
'This is the first line. \n'
>>> line2 = f.readline[] # reading a line
>>> line2
'This is the second line.\n'
>>> line3 = f.readline[] # reading a line
>>> line3
'This is the third line.'
>>> line4 = f.readline[] # reading a line
>>> line4
''
>>> f.close[] # closing file object
Membaca Baris
Contoh berikut menunjukkan membaca baris dari file
Contoh. Garis Bacaan
Salinan>>> f = open['C:\myfile.txt'] # opening a file
>>> line1 = f.readline[] # reading a line
>>> line1
'This is the first line. \n'
>>> line2 = f.readline[] # reading a line
>>> line2
'This is the second line.\n'
>>> line3 = f.readline[] # reading a line
>>> line3
'This is the third line.'
>>> line4 = f.readline[] # reading a line
>>> line4
''
>>> f.close[] # closing file object
Seperti yang Anda lihat, kita harus membuka file dalam mode
>>> f = open['C:\myfile.txt'] # opening a file
>>> line1 = f.readline[] # reading a line
>>> line1
'This is the first line. \n'
>>> line2 = f.readline[] # reading a line
>>> line2
'This is the second line.\n'
>>> line3 = f.readline[] # reading a line
>>> line3
'This is the third line.'
>>> line4 = f.readline[] # reading a line
>>> line4
''
>>> f.close[] # closing file object
>>> f = open['C:\myfile.txt'] # opening a file
>>> line1 = f.readline[] # reading a line
>>> line1
'This is the first line. \n'
>>> line2 = f.readline[] # reading a line
>>> line2
'This is the second line.\n'
>>> line3 = f.readline[] # reading a line
>>> line3
'This is the third line.'
>>> line4 = f.readline[] # reading a line
>>> line4
''
>>> f.close[] # closing file object
Membaca Semua Baris
Berikut ini membaca semua baris menggunakan fungsi
>>> f = open['C:\myfile.txt'] # opening a file
>>> line1 = f.readline[] # reading a line
>>> line1
'This is the first line. \n'
>>> line2 = f.readline[] # reading a line
>>> line2
'This is the second line.\n'
>>> line3 = f.readline[] # reading a line
>>> line3
'This is the third line.'
>>> line4 = f.readline[] # reading a line
>>> line4
''
>>> f.close[] # closing file object
Contoh. Membaca File
Salinan>>> f = open['C:\myfile.txt'] # opening a file
>>> lines = f.readlines[] # reading all lines
>>> lines
'This is the first line. \nThis is the second line.\nThis is the third line.'
>>> f.close[] # closing file object
Objek file memiliki iterator bawaan. Program berikut membaca file yang diberikan baris demi baris hingga
>>> f = open['C:\myfile.txt'] # opening a file
>>> line1 = f.readline[] # reading a line
>>> line1
'This is the first line. \n'
>>> line2 = f.readline[] # reading a line
>>> line2
'This is the second line.\n'
>>> line3 = f.readline[] # reading a line
>>> line3
'This is the third line.'
>>> line4 = f.readline[] # reading a line
>>> line4
''
>>> f.close[] # closing file object
Contoh. Berkas Iterator
Salinanf=open['C:\myfile.txt']
while True:
try:
line=next[f]
print[line]
except StopIteration:
break
f.close[]
Gunakan for loop untuk membaca file dengan mudah
Contoh. Baca File menggunakan For Loop
Salinanf=open['C:\myfile.txt']
for line in f:
print[line]
f.close[]
Keluaran
This is the first line.
This is the second line.
This is the third line.
Membaca File Biner
Gunakan mode 'rb' dalam fungsi
>>> f = open['C:\myfile.txt'] # opening a file
>>> lines = f.read[] # reading a file
>>> lines
'This is the first line. \nThis is the second line.\nThis is the third line.'
>>> f.close[] # closing file object
Contoh. Membaca File
Salinan>>> f = open['C:\myimg.png', 'rb'] # opening a binary file
>>> content = f.read[] # reading all lines
>>> content
b'\x89PNG\r\n\x1a\n\x00\x00\x00\rIHDR\x00\x00\x00\x08\x00\x00\x00\x08\x08\x06
\x00\x00\x00\xc4\x0f\xbe\x8b\x00\x00\x00\x19tEXtSoftware\x00Adobe ImageReadyq
\xc9e\x00\x00\x00\x8dIDATx\xdab\xfc\xff\xff?\x03\x0c0/zP\n\xa4b\x818\xeco\x9c
\xc2\r\x90\x18\x13\x03*8\t\xc4b\xbc\x01\xa8X\x07$\xc0\xc8\xb4\xf0>\\\x11P\xd7?
\xa0\x84\r\x90\xb9\t\x88?\x00q H\xc1C\x16\xc9\x94_\xcc\x025\xfd2\x88\xb1\x04
\x88\x85\x90\x14\xfc\x05\xe2[ \x16\x00\xe2\xc3\x8c\xc8\x8e\x84:\xb4\x04H5\x03
\xf1\\ .bD\xf3E\x01\x90\xea\x07\xe2\xd9\xaeB`\x82'
>>> f.close[] # closing file object
Menulis ke File
Objek file menyediakan metode berikut untuk menulis ke file
- tulis. Tulis string s ke aliran dan kembalikan jumlah karakter yang ditulis
- garis tulis [baris]. Tulis daftar baris ke aliran. Setiap baris harus memiliki pemisah di ujungnya
Buat File baru dan Tulis
Berikut ini membuat file baru jika tidak ada atau menimpa file yang sudah ada
Contoh. Buat atau Timpa ke File yang Ada
Salinan>>> f = open['C:\myfile.txt','w']
>>> f.write["Hello"] # writing to file
5
>>> f.close[]
# reading file
>>> f = open['C:\myfile.txt','r']
>>> f.read[]
'Hello'
>>> f.close[]
Dalam contoh di atas, pernyataan
>>> f = open['C:\myfile.txt'] # opening a file
>>> line1 = f.readline[] # reading a line
>>> line1
'This is the first line. \n'
>>> line2 = f.readline[] # reading a line
>>> line2
'This is the second line.\n'
>>> line3 = f.readline[] # reading a line
>>> line3
'This is the third line.'
>>> line4 = f.readline[] # reading a line
>>> line4
''
>>> f.close[] # closing file object
>>> f = open['C:\myfile.txt'] # opening a file
>>> lines = f.read[] # reading a file
>>> lines
'This is the first line. \nThis is the second line.\nThis is the third line.'
>>> f.close[] # closing file object
>>> f = open['C:\myfile.txt'] # opening a file
>>> lines = f.read[] # reading a file
>>> lines
'This is the first line. \nThis is the second line.\nThis is the third line.'
>>> f.close[] # closing file object
>>> f = open['C:\myfile.txt'] # opening a file
>>> line1 = f.readline[] # reading a line
>>> line1
'This is the first line. \n'
>>> line2 = f.readline[] # reading a line
>>> line2
'This is the second line.\n'
>>> line3 = f.readline[] # reading a line
>>> line3
'This is the third line.'
>>> line4 = f.readline[] # reading a line
>>> line4
''
>>> f.close[] # closing file object
>>> f = open['C:\myfile.txt'] # opening a file
>>> lines = f.readlines[] # reading all lines
>>> lines
'This is the first line. \nThis is the second line.\nThis is the third line.'
>>> f.close[] # closing file object
>>> f = open['C:\myfile.txt'] # opening a file
>>> lines = f.readlines[] # reading all lines
>>> lines
'This is the first line. \nThis is the second line.\nThis is the third line.'
>>> f.close[] # closing file object
>>> f = open['C:\myfile.txt'] # opening a file
>>> lines = f.read[] # reading a file
>>> lines
'This is the first line. \nThis is the second line.\nThis is the third line.'
>>> f.close[] # closing file object
>>> f = open['C:\myfile.txt'] # opening a file
>>> line1 = f.readline[] # reading a line
>>> line1
'This is the first line. \n'
>>> line2 = f.readline[] # reading a line
>>> line2
'This is the second line.\n'
>>> line3 = f.readline[] # reading a line
>>> line3
'This is the third line.'
>>> line4 = f.readline[] # reading a line
>>> line4
''
>>> f.close[] # closing file object
Menambahkan ke File yang Ada
Berikut ini menambahkan konten di akhir file yang ada dengan meneruskan mode
>>> f = open['C:\myfile.txt'] # opening a file
>>> lines = f.readlines[] # reading all lines
>>> lines
'This is the first line. \nThis is the second line.\nThis is the third line.'
>>> f.close[] # closing file object
>>> f = open['C:\myfile.txt'] # opening a file
>>> lines = f.readlines[] # reading all lines
>>> lines
'This is the first line. \nThis is the second line.\nThis is the third line.'
>>> f.close[] # closing file object
>>> f = open['C:\myfile.txt'] # opening a file
>>> lines = f.read[] # reading a file
>>> lines
'This is the first line. \nThis is the second line.\nThis is the third line.'
>>> f.close[] # closing file object
Contoh. Tambahkan ke File yang Ada
Salinan>>> f = open['C:\myfile.txt','a']
>>> f.write[" World!"]
7
>>> f.close[]
# reading file
>>> f = open['C:\myfile.txt','r']
>>> f.read[]
'Hello World!'
>>> f.close[]
Tulis Beberapa Baris
Python menyediakan metode
>>> f = open['C:\myfile.txt'] # opening a file
>>> lines = f.readlines[] # reading all lines
>>> lines
'This is the first line. \nThis is the second line.\nThis is the third line.'
>>> f.close[] # closing file object
Contoh. Tulis Baris ke File
Salinan>>> f = open['C:\myfile.txt'] # opening a file
>>> lines = f.read[] # reading a file
>>> lines
'This is the first line. \nThis is the second line.\nThis is the third line.'
>>> f.close[] # closing file object
Membuka file dengan mode "w" atau mode "a" hanya dapat ditulis dan tidak dapat dibaca. Demikian pula mode "r" memungkinkan hanya membaca dan tidak menulis. Untuk melakukan operasi baca/tambahkan secara bersamaan, gunakan mode "a+".
Menulis ke File Biner
Fungsi
>>> f = open['C:\myfile.txt'] # opening a file
>>> lines = f.read[] # reading a file
>>> lines
'This is the first line. \nThis is the second line.\nThis is the third line.'
>>> f.close[] # closing file object
>>> f = open['C:\myfile.txt'] # opening a file
>>> lines = f.readlines[] # reading all lines
>>> lines
'This is the first line. \nThis is the second line.\nThis is the third line.'
>>> f.close[] # closing file object
f=open['C:\myfile.txt']
while True:
try:
line=next[f]
print[line]
except StopIteration:
break
f.close[]
f=open['C:\myfile.txt']
while True:
try:
line=next[f]
print[line]
except StopIteration:
break
f.close[]
Kode berikut menyimpan daftar angka dalam file biner. Daftar ini pertama kali dikonversi dalam array byte sebelum ditulis. Fungsi bawaan bytearray[] mengembalikan representasi byte dari objek
Bagaimana cara mengubah gambar menjadi file biner dengan Python?
Pendekatan. .
Baca gambar dari lokasi
Karena gambar berwarna memiliki lapisan RGB di dalamnya dan lebih kompleks, ubahlah menjadi bentuk Grayscale terlebih dahulu
Siapkan tanda Ambang, piksel di atas tanda yang diberikan akan menjadi putih, dan di bawah tanda akan menjadi hitam
Bagaimana cara mengubah file gambar menjadi biner?
BW = im2bw[ I , level ] mengonversi gambar skala abu-abu I menjadi gambar biner BW , dengan mengganti semua piksel pada gambar input dengan pencahayaan yang lebih besar dari level dengan nilai 1 [ . Kisaran ini relatif terhadap tingkat sinyal yang mungkin untuk kelas gambar.
Bagaimana Anda menulis file biner dengan Python?
Untuk menulis string biner ke file biner, Anda perlu membuka file dalam mode “binary write” menggunakan 'wb' sebagai argumen posisi kedua dari open[] . Misalnya, Anda akan menulis open['my_file. bin', 'wb'] bukannya open['my_file. bin', 'w']. . For instance, you'd write open['my_file. bin', 'wb'] instead of open['my_file. bin', 'w'] .
Bagaimana Anda Binarisasi gambar dengan Python?
Anda dapat membuat biner gambar dengan cv2. ambang[] . Jika tipe diatur ke cv2. THRESH_BINARY , nilai apa pun yang lebih besar dari threshold thresh diganti dengan maxval dan nilai lainnya diganti dengan 0.