Add files via upload

Python/ch4.File Handling/Work with Binary File_1.py

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+>>> a = b'\x02\xA1\x80'
+>>> a
+b'\x02\xa1\x80'
+>>> a[0]
+2
+>>> a[1]
+161
+>>> a[2]
+128
+>>> a[3]
+Traceback (most recent call last):
+  File "<stdin>", line 1, in <module>
+IndexError: index out of range
+>>> type(a)
+<class 'bytes'>
+>>> list(a)
+[2, 161, 128]

Python/ch4.File Handling/Work with Binary File_2.py

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+>>> a = b'ab_*'
+>>> list(a)
+[97, 98, 95, 42]

Python/ch4.File Handling/Work with Binary File_3.py

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+>>> a = bytes([1, 129, 231])
+>>> a
+b'\x01\x81\xe7'
+>>> list(a)
+[1, 129, 231]
+>>> a[1:3]
+b'\x81\xe7'
+>>> a = bytes([1, 260])
+Traceback (most recent call last):
+  File "<stdin>", line 1, in <module>
+ValueError: bytes must be in range(0, 256)

Python/ch4.File Handling/Work with Binary File_4.py

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+with open('src.png', 'rb') as src:
+    data = src.read()
+    with open('dst.png', 'wb') as dst:
+        dst.write(data)

Python/ch4.File Handling/Work with Text File_1.py

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+# Reading Characters of File
+>>> f = open("info.txt", "r")
+>>> f.read(6)
+'Hello;'
+>>> f.read(6)
+'\nI am '

Python/ch4.File Handling/Work with Text File_2.py

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+# Reading Lines of File
+f = open("Info.txt", "r")
+lines = []
+while True:
+    line = f.readline()
+    if line == '':
+        break # end of file
+    lines.append(line)
+lines.reverse()
+for line in lines:
+    print(line, end = '')

Python/ch4.File Handling/Work with Text File_3.py

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+# Writing in File
+n = int(input())
+f = open("dst.txt", "w")
+for i in range(n):
+    line = input()
+    f.write(line + '\n')

Python/ch4.File Handling/Work with Text File_4.py

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+# File Pointer
+>>> f = open("test.txt", "w")
+>>> f.tell()
+0
+>>> f.write("salam")
+5
+>>> f.tell()
+5
+>>> f.write("ali")
+3
+>>> f.tell()
+8
+
+f = open("a.txt", "r")
+l, r = (int(x) for x in input().split())
+f.seek(l)
+s = f.read(r - l + 1)
+print(s)

Python/ch4.File Handling/Work with Text File_5.py

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+# Closing File
+with open("file address", "opening mode") as f:
+    #tasks to do with file
+    pass

Python/ch4.File Handling/Work with Text File_6.py

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+# Application of Generators in Files
+def csv_reader(path):
+    file = open(path)
+    result = file.read().split("\n")
+    return result
+
+def csv_reader(path):
+    with open(path) as file:
+        for row in file:
+            yield row

Python/ch4.File Handling/info.txt

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+Hello;
+I am Mohamadreza.

Python/ch4.File Handling/opening file_1.py

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+f = open("file address", "opening mode")

Python/ch4.File Handling/opening file_2.py

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+# File Object
+>>> f = open('a.txt')
+>>> f
+<_io.TextIOWrapper name='a.txt' mode='r' encoding='UTF-8'>
+>>> type(f)
+<class '_io.TextIOWrapper'>