Python Syntax
Syntax refers to a set of rules that need to be followed while writing the Python code. An error that occurs when Python programmer does not follow the Python rules is called syntax error.
print(1+1) — no error
print(1+2 — syntax error
Statements in Python
Statement: Statement is an instruction that Python engine can execute. The statement goes through the parts of the Python engine ( syntax checker, compiler, and interpreter) and performs the particular task, and displays it on the screen. The executed instruction is called statement.
Writing of Statement
There are types of writing of statements
1.Single Statement in Single line
Single statement in single line and multiple statements in multiple lines gives the same meaning. Writing a single instruction that has to be executed in a single line is a single statement in single line.
ex: print (2+2)
In multiple lines
ex:
- print(2+3)
- print(4+2)
- print(6+2)
2. Multiple statements in single line
Writing Multiple statelents in a single line. To write multiple statements in single line use “;” after every statement.
ex: print(1+1); print(2+2); print(3+3)
3.Single statement in multiple lines
Writing a single statement in multiple lines. To write a single statement in multiple lines symbol \ backslash or ( ) parenthesis is used. To avoid using \ backslash n number of times use ( )
parenthesis.
ex: using \ backslash
1+\
2+2–5\
+2\
-4
If we add \ backslash after the last value, it shows an error (incomplete input error).
ex: by using ( ) parenthesis
(1+2
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+3
+5–6
+10)
Comments
Comments are also instructions that are not executed by the python engine. Comments are used to understand the code easily, debug the code easily.
By using the symbol hash # before an instruction, it is considered as a comment.
- ex: #2+3+4
Keywords
Keywords are the reserved words in the Python engine.
It has special meaning in the Python engine. There are 35 keywords in Python.
Variable
Variable is a temporary name given to a memory location. We store the Python data in memory. To reuse the data again and again, we store data in the memory. By using assignment operator “=” the data is stored.
syntax — variable name = dataex: x=10
There are some that have to be followed while creating the variable names called Naming Convention.
Naming convention
Naming convention is a set of Python rules that have to be followed by the programmer to create the variable names.
a. Variable name should always start with an alphabet or underscore(_)
xyz=30
_xy=30
b. Variable name shouldn’t contain any special symbols except underscore.
x_yz=20
x@yz=20 — shows error
c. Variable name can contain numerics , but not as the first character.
var1=30
d. Python is a case-sensitive language.
- abc=20
- Abc=20
both are 2 different variables
e. Never use keywords as variable names
True=10 — error
