2,3,4 for ch4

Author: AstinCHOI

4장_구조와_모듈/2_fib_generator.py

@@ -0,0 +1,12 @@
+def fib_generator():
+    a, b = 0, 1
+    while True:
+        yield b
+        a, b = b, a+b
+
+if __name__ == '__main__':
+    fib = fib_generator()
+    print(next(fib))
+    print(next(fib))
+    print(next(fib))
+    print(next(fib))

4장_구조와_모듈/3_grep_word_from_files.py

@@ -0,0 +1,16 @@
+import sys
+
+def grep_word_from_files():
+    word = sys.argv[1]
+    for filename in sys.argv[2:]:
+        with open(filename) as file:
+            for lino, line in enumerate(file, start=1):
+                if word in line:
+                    print("{0}:{1}:{2:.40}".format(filename, lino, line.rstrip()))
+      
+if __name__ == '__main__':
+    if len(sys.argv) < 2:
+        print("Usage: grep_word_from_files.py word infile1 [infile2...]")
+        sys.exit()
+    else:
+        grep_word_from_files()

4장_구조와_모듈/4_remove_blank_lines.py

@@ -0,0 +1,41 @@
+import os
+import sys
+
+def read_data(filename):
+    lines = []
+    fh = None
+    try:
+        fh = open(filename)
+        for line in fh:
+            if line.strip():
+                lines.append(line)
+    except (IOError, OSError) as err:
+        print(err)
+    finally:
+        if fh is not None:
+            fh.close()
+    return lines
+
+def write_data(lines, filename):
+    fh = None
+    try:
+        fh = open(filename, "w")
+        for line in lines:
+            fh.write(line)
+    except (EnvironmentError) as err:
+        print(err)
+    finally:
+        if fh is not None:
+            fh.close()
+
+def remove_blank_lines():
+    if len(sys.argv) < 2:
+        print ("Usage: noblank.py infile1 [infile2...]")
+
+    for filename in sys.argv[1:]:
+        lines = read_data(filename)
+        if lines:
+            write_data(lines, filename)          
+            
+if __name__ == '__main__':
+    remove_blank_lines()

4장_구조와_모듈/hello.py

@@ -1,8 +1,6 @@
 hello = "hello"
-
 def world():
     return "world"
-
 if __name__ == '__main__':
     print(f"{__name__} 직접 실행됨.")
 else: