How can I write multi-line code in the Terminal use python?

Question

How can I write multi-line code in the python REPL? :

aircraftdeMacBook-Pro:~ ldl$ python
Python 2.7.10 (default, Jul 30 2016, 19:40:32) 
[GCC 4.2.1 Compatible Apple LLVM 8.0.0 (clang-800.0.34)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>>

such as a sample example:

i = 0

while i < 10:
    i += 1
    print i

In the terminal I don’t know hot to line feed in the python shell:

I tested the Control+Enter, and Shift+Enter, and Command+Enter, they all wrong:

>>> while i < 10:
... print i 
  File "<stdin>", line 2
    print i 
        ^
IndentationError: expected an indented block

Asked By: aircraft

||

Source

Answer 1

You can add a trailing backslash. For example, if I want to print a 1:

>>> print 1
1
>>> print 
... 1
1
>>>

If you write a , Python will prompt you with … (continuation lines) to enter code in the next line, so to say.

To resolve IndentationError: expected an indented block, put the next line after while loop in an indented block (press Tab key).

So, the following works:

>>> i=0
>>> while i < 10:
...   i+=1
...   print i
... 
1
2
3
4
5
6
7
8
9
10

Answered By: Wasi Ahmad

Answer 2

Just copy the code and past it in the terminal, and press return. This code works perfect if you do that:

   i = 0 
..  
.. while i < 10: 
..     i += 1 
..     print(i)  
..   

1
2
3
4
5
6
7
8
9
10

Answered By: developer_hatch

Answer 3

There comes out:

IndentationError: expected an indented block

So, when use the while loop, the next line should have the indented block(press Tab key).

>>> i = 0
>>> while i < 10:
...     i += 1
...     print i 
... 
1
2
3
4
5
6
7
8
9
10
>>>

Answered By: aircraft

Answer 4

Utilize the python3 - <<'EOF' command.

For instance:

python3 - <<'EOF'
a=7
b=5
print(a+b)
EOF

12

Answered By: anshul singh

Answer 5

Python automatically detects code blocks in sections like for-next, while, etc. Just put a ‘:’ <– Colon symbol after some code.

Then the next line will have a continuation symbol (‘…’) in front of it instead of the prompt (‘>>>’)

Remember to press a tab to indent the code that you want to execute in the block. That will indent the line and tell Python that the code that follows is a part of the block.

Answered By: Cyril Gupta

Answer 6

Different approaches for the same problem.

This solution might be complex, but working my ubuntu

one line of python script can

import yaml and sys lib
lambda-function read yaml file by using first sys.argv1
get expected value from return nested-dictionary from lambda function by using sys.argv2 sys.argv3
print yaml_as_dict will load test_var as variable
check test_var by echo $test_var

`

$
$ test_var=$(python3 -c $"import yaml,sys; yaml_as_dict=(lambda :yaml.safe_load(open(f'{sys.argv[1]}','r').read()))()[sys.argv[2]][sys.argv[3]]; print(yaml_as_dict)" <argv1> <argv2> <argv3>)
$
$ echo $test_var
$

How to execute multiline python code from a bash script?

How can I put multiple statements in one line?

Answered By: P_M

How can I write multi-line code in the Terminal use python?

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