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{
"metadata": {
"name": "",
"signature": "sha256:3748f84e3bd0279efe47855bd2c4e23912ef725121f3591980fa33e19d6ccae4"
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter 14, Input/Output and Files"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Program 14-5, Page Number: 424"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"# Files : Opening and Closing\n",
"\n",
"# Open the file for writing\n",
"\n",
"file_pointer = open(\"first_file\",\"w\")\n",
"\n",
"print \"Enter text:\"\n",
"\n",
"# Get characters and place them in the file\n",
"\n",
"text = \"BASIC is easy,\\nFORTAN is fun,\\nPascal may be structured,\\nBut C's the one!\"\n",
"print text\n",
"file_pointer.write(text)\n",
"\n",
"file_pointer.close()\n",
"\n",
"file_pointer = open(\"first_file\",\"r\")\n",
"\n",
"#Display the text from file\n",
"\n",
"print \"\\nYou entered:\"\n",
"print file_pointer.read()\n",
"\n",
"file_pointer.close()"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter text:\n",
"BASIC is easy,\n",
"FORTAN is fun,\n",
"Pascal may be structured,\n",
"But C's the one!\n",
"\n",
"You entered:\n",
"BASIC is easy,\n",
"FORTAN is fun,\n",
"Pascal may be structured,\n",
"But C's the one!\n"
]
}
],
"prompt_number": 1
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Program 14-6, Page Number: 426"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"# Using several files\n",
"\n",
"# Open the source file for reading\n",
"\n",
"first_file_pointer = open(\"first_file\",\"r\")\n",
"\n",
"# Open the destination file for writing\n",
"\n",
"second_file_pointer = open(\"second_file\",\"w\")\n",
"\n",
"# Transfer characters from source to destination file\n",
"\n",
"c = first_file_pointer.read()\n",
"second_file_pointer.write(c)\n",
"\n",
"# Close both files\n",
"\n",
"first_file_pointer.close()\n",
"second_file_pointer.close()\n",
"\n",
"# Open second file for displaying contentes\n",
"\n",
"second_file_pointer = open(\"second_file\",\"r\")\n",
"print(\"'second_file' contains:\")\n",
"print second_file_pointer.read()"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"'second_file' contains:\n",
"BASIC is easy,\n",
"FORTAN is fun,\n",
"Pascal may be structured,\n",
"But C's the one!\n"
]
}
],
"prompt_number": 2
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Program 14-7, Page Number : 428"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"# Append mode\n",
"\n",
"# Open the first file for writing\n",
"\n",
"first_file_pointer = open(\"first_file\",\"w\")\n",
"\n",
"# Open the second file for appending\n",
"\n",
"second_file_pointer = open(\"second_file\",\"a\")\n",
"\n",
"# Writing to both files\n",
"\n",
"first_file_pointer.write(\"\\n--Anonymous\\n\")\n",
"second_file_pointer.write(\"\\n--Anonymous\\n\")\n",
"\n",
"# Close both files\n",
"\n",
"first_file_pointer.close()\n",
"second_file_pointer.close()\n",
"\n",
"# Display the contents of first file\n",
"first_file_pointer = open(\"first_file\",\"r\")\n",
"print(\"After write, 'first_file contains:\")\n",
"print first_file_pointer.read()\n",
"\n",
"# Display the contents of second file\n",
"second_file_pointer = open(\"second_file\",\"r\")\n",
"print(\"After append, 'second_file' contains:\")\n",
"print second_file_pointer.read()"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"After write, 'first_file contains:\n",
"\n",
"--Anonymous\n",
"\n",
"After append, 'second_file' contains:\n",
"BASIC is easy,\n",
"FORTAN is fun,\n",
"Pascal may be structured,\n",
"But C's the one!\n",
"--Anonymous\n",
"\n"
]
}
],
"prompt_number": 3
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Program 14-8, Page Number: 431"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"# The seek function\n",
"\n",
"# Open file for reading\n",
"try :\n",
"\tfile_pointer = open(\"second_file\",\"r\")\n",
"except :\n",
"\tprint \"'second_file' cannot be opened\"\n",
"\texit ()\n",
"\n",
"# Skip the first 6 characters\n",
"\n",
"file_pointer.seek(6,0)\n",
"print file_pointer.read()"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"is easy,\n",
"FORTAN is fun,\n",
"Pascal may be structured,\n",
"But C's the one!\n",
"--Anonymous\n",
"\n"
]
}
],
"prompt_number": 4
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Program 14-9, Page Number: 433"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"# The 'w+' mode and seek to rewind a file\n",
"\n",
"# Open a file for read/write\n",
"file_pointer = open(\"first_file\",\"w+\")\n",
"\n",
"print \"Enter text:\"\n",
"text = \"BASIC is easy,\\nFORTAN is fun,\\nPascal may be structured,\\nBut C's the one!\"\n",
"print text\n",
"file_pointer.write(text)\n",
"\n",
"file_pointer.seek(0,0)\n",
"\n",
"# Display the file\n",
"print \"\\nYou entered:\"\n",
"print file_pointer.read()"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter text:\n",
"BASIC is easy,\n",
"FORTAN is fun,\n",
"Pascal may be structured,\n",
"But C's the one!\n",
"\n",
"You entered:\n",
"BASIC is easy,\n",
"FORTAN is fun,\n",
"Pascal may be structured,\n",
"But C's the one!\n"
]
}
],
"prompt_number": 5
}
],
"metadata": {}
}
]
}
|
